Thanks for the feedback. based on your replies I gather that if the warehouse is whs management controlled there is no way of backflushing from a specific location and you always need to pick against the order.
Just echoing what Fredrik said. It's the same with Sales and Purchase order lines - if Warehouse management is enabled on the item and warehouse, AX won't fill in the location on the line. If this is the case, it is not possible to get the location to automatically appear on the Production BOM line. I assume that the warehouse management production picking function is in someway useful here, but I've never tried it.
The idea of the WHS solution is that the location directives are supposed to select this. Releasing the order to warehouse will activate this and then fin an appropriate location.
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