How to assign external warehouse number to supply chain unit in ewm ?

Dear experts,

i distribute outbound deliveries from ERP to EWM and as i look into 'SMQ2' there is a message with the following problem:

But we already did the following configurations:

Do you have any idea what configuration (maybe customizing) is missing ? or maybe which configuration in our supply chain unit is necessary ?

Thanks in advance

Merry Christmas

BR

Denis