Hi,
Kindly check following config has been done properly or not?
1. SPRO > MM > Purchasing > Purchase Order > Set up Stock Transport Order > Define Shipping Data for Plants
2. SPRO > MM > Purchasing > Purchase Order > Set up Stock Transport Order > Assign Delivery Type and Checking Rule
Here assign the delivery type to PO document type. In this case, Delivery type NL or NLCC is assigned to Document type UB or NB respectively and Checking Rule as "B".
After this go to SPRO > MM > Purchasing > Environment Data > System messages - Here make Message No 06450 i.e. &1 Of material &2, only &3 &4 are available on desired date as ERROR.
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