When i create P.O , With Mtl group ref & W/O mtl no - the Error msg as follows.
Please enter material number or account assignment category
Message no. 06026
You have entered neither the material number nor the account assignment
category in the item. An item representing a material without a master
record (i.e. no material number is specified) or a service must have an
account assignment category.
Enter a valid material number.
If you wish to procure a material without a master record or a service,
enter a suitable account assignment category for the item.