SAP Message AD115 - Field & (Value & is not permitted)

Diagnosis
You have not made a valid entry in the field specified or a fieldcontains an incorrect value due to a program error.

Procedure
First check if you made an incorrect entry. Make a valid entry. You canobtain help for the entry by pressing the F4=input help key.
If you have not made an incorrect interactive entry, please contactyour system administrator.