Change of SUoM in ERP after GI

Hi experts,

we have some problems with the Sales Unit in ERP after GI booking in EWM.

If the delivery in ERP has delivery type NLCC (Replen), position type NLC (InterCo Stock Tr.Itm), EWM changes the Sales Unit from SU (SalesUnit) to PC (Piece), for "normal" deliverys (LF) it's not changed.

Already checked mapping of delivery type/position type --> both are OUTB / ODLV.

Customizing EWM

SPRO --> Goods Issue Process --> Outbound Delivery --> Manual Settings --> Define Item Types for Outbound Delivery Process --> For item type with doc. category FDO, field "Update Delivery Item SUoM." is unchecked all the time

What else I need to check?

Thanks

Michael