SAP Message 06255 - Please maintain period indicators for language &

Diagnosis
The period indicators (identifiers for day, month, week) have not beenmaintained in the document language &. They are needed for the documentprintout.

Procedure
To prevent the print program from aborting due to the missing tableentries, you must supply the relevant indicators.
To find out how to do this, refer to the IMG
Maintain display type for date/period