I created a material thru mm01. Now, I want to create a purchase order for this material thru me21n. I got the error message "account assignment is mandatory". If I pick a value under a/c assignment, it'll again ask me to assign gl a/c. I know, a/c assignment field is not mandatory field to create PO. Also I checked the field status under vendor master. It is not mandatory. Does anybody have solution. I'll appreciate for the answer.