Diagnosis
This field is already used in tables /BEV1/EMPTYP (item categories)and/or /BEV1/EMMATRIX (calculation matrix). Changing the field type ordeleting the field can lead to errors.

Procedure
If possible, do not change the field type nor delete small fields. If,however, you really do need to perform one of these actions ensure thatthis will not lead to any problems.
You can terminate the action by pressing the button with the red crossor you can confirm a warning message using the green arrow and then
change or delete the empties field.