Message SAP WVFI_ADD002 - Value & in field "date of entry" is not a valid date

Diagnosis
The field "date of entry with a PDC device" contains the value &V1&.This value is not a valid date format.

System Response
The system cannot post this item.

Procedure
Enter the date in this field in the format YYYYMMDD (example:20011123). You can use the IDoc Editor to change the field content andpost the IDoc again.