Greetings
Since MAIN is configured with Adv Warehousing and BASIC with Basic Warehousing, you cannot do a direct transfer. Here's a way you can explore:
1. Perform a negative adjustment of all items in MAIN via Whse Item Journal & item journal respectively - as per the standard process. After performing this activity, the items will have 0 stock in your MAIN warehouse
2. For the same items you now create a Item Journal, with positive adjustment and choose "BASIC" warehouse
3. Post the item journal created for BASIC warehouse
You have now moved your items from one location to another
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