SAP Message BEA_ITL144 - The official document number is longer than the allowed length of 16

Diagnosis For the number format &V1& for document class &V2& and country &V3&the official document number will have a length of &V4&. This islonger than the maximum allowed length of 16 for the reference documentfield (XBLNR) in the OLTP system. Part of the official document numbercould be lost if it is transferred to the reference document field(XBLNR) in the OLTP system. Procedure Change the number format accordingly.