SAP Message BEA_ITL102 - Print character not maintained for tax groups &1 and &2 &3

Diagnosis
The number format &3 for document class &1 and country2 requires a printing character to be maintained. this printingcharacter has not been maintained.

System Response
The Official Document Numbering cannot be carried out for themaintained number format.

Procedure
Maintain the number format in the customizing table or change yournumber format to exclude the printing character.