Beas - WO Stock Transfer Request: wrong destination warehouse

Our customer wants to create Stock Transfer Requests form WO.

Scenario:

- At WO BOM level, warehouse PROD is set up (this is the warehouse where raw materials should be consumed) 

- PROD warehouse is set up as 'Allocation warehouse' in warehouse extended master data

- MAIN warehouse is set up as 'Default'. This is the warehouse where the goods are stored.

Expected behaviour

1- When opening 'WO Stock Transfer Request' window from WO BOM position, PROD warehouse is selected in header as allocation warehouse

2- In the bottom-left panel, stock in MAIN warehouse is visible.

3- Clicking on 'All pre-assign' button fills 'Request' column with needed quantities

4- Clicking on 'Create Request' creates an SBO Stock Transfer Request from MAIN warehouse to PROD warehouse.  

Actual behaviour:

Steps 1-3 occurs as expected

Step 4 fails because beas tries to create a Stock Transfer Request from PROD to PROD with error: (feinbh5) Goods issue slip could not be created : WO Stock Transfer Request: (-5002) 1250000017 - Receipt warehouse cannot be identical to the release warehouse.

Are we missing some setup?

Thanks and regards