Diagnosis
In IS-Retail, you can only maintain plants with reference to acustomer number in the plant table (T001W-KUNNR).

Procedure
When creating a plant with the IS-Retail transaction (WR01), thiscustomer number is automatically updated.
If these are plants that were created within standard views, youshould try to create a customer number with the appropriate accountgroup (or plant profile) with the standard function from SD(Logistics -> Sales/distribution) and add this in the fieldT001W-KUNNR using the 'Table Maintenance T001W' function.