Integrate
This message is confusing because the field is an input field. A possible cause of this error is that the user recorded the transaction and made a mistake in the recording but did not realize the mistake was made until they had entered data in other fields. They received the error, then went back and corrected the data. This is not a good practice for recording because when the data is posted, it posted correctly, then SAP will try to go back into the field to correct the data and it will no longer be an input field.
