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Onboarding and Stock Feeding
The transition to a new fulfillment partner is decided in the first few weeks. Onboarding and stock feeding are the phases in which master data, systems, and physical inventory must come together. Those who plan systematically avoid pick errors and inventory discrepancies; those who underestimate the effort pay with complaints and manual corrections.
What Onboarding with a Fulfillment Service Provider Means
Onboarding refers to the structured start of collaboration with a 3PL provider – from contract signing to productive shipping. Stock feeding is the physical part: products are transported, inspected, and stored for the first time.
Distinction: Onboarding vs. Ongoing Goods Receipt
Overall Onboarding Process
The Phases of 3PL Onboarding in Detail
Professional onboarding follows a fixed sequence – especially do not jump directly from contract signing to sending goods.
Phase 1: Kick-off and Project Team
At the start, both sides name fixed contacts for project, IT, and warehouse. In the kick-off, timeline, milestones, and escalation paths are defined. Result: written onboarding plan with RACI matrix and fixed go-live date.
Phase 2: Master Data and Product Setup
Every SKU must be fully set up in the WMS: article number, EAN, weight, dimensions, packaging unit, and if applicable batch or hazardous goods classification. Incorrect measurements lead to wrong shipping costs or carrier rejections.
Required fields for product setup:
- Unique SKU or article number (see glossary)
- Gross weight including product packaging
- Length, width, height of the sales unit
- Barcode (EAN-13 or internal code)
- Product category and if applicable warehouse zone requirement (chilled goods, hazardous goods)
- Best-before date or serial number requirement, if applicable
Phase 3: Technical Integration and Test Orders
Before real customer orders flow, the interface must work flawlessly: order export, inventory feedback, tracking, and returns booking. Run at least five test orders with different scenarios. The technical integration should be validated before the first goods receipt.
Phase 4: Packing Instructions and Special Requirements
Define carton size, filling material, inserts, and branding elements per SKU or product group. Document packing instructions with photos for complex items and have them confirmed by the warehouse.
Phase 5: Plan and Execute Stock Feeding
Stock feeding is the moment when your assortment physically arrives at the fulfillment center. Plan delivery quantity, delivery date, packaging unit (single unit, outer carton, pallet), and means of transport. Notify the delivery in good time via ASN (Advance Shipping Notice) – this allows the warehouse to prepare for goods receipt and shortens put-away time.
Stock Feeding: From Planning to Booking
Create and Submit ASN
An ASN informs the 3PL partner in advance about an upcoming delivery: which SKUs, in what quantity, on how many pallets, expected arrival date, delivery note number. Without an ASN, goods receipt takes longer because the warehouse cannot plan. Details on format and significance can be found in the glossary entry on ASN and Advance Shipping Notice.
Physical Requirements for the Initial Delivery
The first delivery to the fulfillment center should be cleanly structured. The service provider can only put away goods as quickly as they are prepared and labeled.
Requirements for cartons and pallets:
- Each carton labeled with visible SKU and quantity
- Pallets with delivery note in wrap or document pouch
- Uniform packaging units (no mixed cartons without content list)
- No damaged goods without prior consultation
- GS1-128 labels recommended for larger volumes
Goods Receipt at 3PL: What Happens in the Warehouse
After arrival, your goods go through a standardized inbound process in the partner's WMS:
- Gate registration – truck check against ASN
- Unloading and counting – spot check or full count per agreement
- Quality inspection – visual check, dimension check, barcode scan
- Discrepancy report – deviations from ASN are documented
- Put-away – assignment of storage locations per zoning rules
- Inventory booking – release in system, visibility for your shop
Typical Onboarding Timeline
Inventory Reconciliation After Stock Feeding
After goods receipt, compare the booked inventory in the 3PL system with your expectations. Typical causes of discrepancies: incorrect quantities, damaged units, SKU mix-ups, or put-away not yet completed. Conduct a written inventory reconciliation and have it confirmed by both sides before enabling automatic order transfer.
of onboarding delays are caused by incomplete master data
of delays due to missing or incorrect ASNs
Investment in preparation pays off immediately
Go-Live: From Test Operation to Live Shipping
Go-live should be phased – initially with a limited assortment or reduced daily volume. Monitor the first 50 to 100 orders for pick accuracy, shipping speed, and tracking feedback.
Go-Live Checklist
Before go-live – mandatory check:
- All active SKUs in WMS with correct dimensions and weights
- Interface: order export, inventory, tracking tested
- Packing instructions for all SKUs documented and confirmed by warehouse
- ASN for initial delivery submitted correctly
- Goods receipt completed, inventory reconciliation without open discrepancies
- SLA metrics and reporting access set up
- Escalation contacts known on both sides
- Returns process defined and tested
- Customer service informed about new delivery times and processes
- Emergency plan for system outage documented
On go-live day:
- Morning briefing with 3PL project team
- Manually monitor first live orders
- Check shop inventory display against WMS
- Verify tracking emails to test customers
- Evening review: log errors, define corrective actions
Master Data Quality Before Goods Receipt
- SKU unique
- EAN scanned
- Weight measured
- Dimensions measured
- Barcode readable
- Category correct
- Hazardous goods classified
- Image available
- Packing instruction stored
- Test scan in WMS successful
Avoiding Common Onboarding Mistakes
Many retailers repeat the same mistakes – regardless of industry or assortment size. The following overview helps with self-check.
SLA and Expectation Management
Contractual SLAs define response times, goods receipt duration, and cut-off times. Clarify which SLAs apply during the onboarding phase and from when regular operational SLAs take effect.
Practical Example: Onboarding a Fashion Retailer
An online retailer with 320 SKUs switches from in-house warehouse to a 3PL. Eight weeks of onboarding: master data cleanup and dimension verification (week 1–2), WMS import with barcode corrections (week 3), five test orders including returns (week 4), packing instructions and ASN for 18 pallets (week 5), goods receipt with resolved discrepancies (week 6), phased go-live (week 7–8). Result: 99.4 percent pick accuracy in the first 30 days.
Stock Feeding in Detail
In case of discrepancies during goods receipt inspection, a clarification loop back to ASN correction takes place before put-away and inventory release are completed.
After Onboarding: Continuous Stock Feeding
Onboarding does not end with go-live. Every replenishment delivery follows the same principle: ASN in advance, clean labeling, timely inventory reconciliation. New variants need complete master data before the first unit reaches the warehouse – see SKU and article number.
Related Topics
- Working with the Service Provider
- Technical Integration
- Contract and SLA Negotiation
- ASN and Advance Shipping Notice
- WMS Warehouse Management System
Last updated: July 6, 2026