Be aware that the contents of the data buffer may be code-page converted if the buffer is passed between CICS® systems, in which case the data should be limited to ASCII and EBCDIC characters.
If a CICS transaction issues EXEC CICS SEND MAP and EXEC CICS RECEIVE MAP commands, CICS converts the data from the BMS structure to a 3270 data stream. In this case, the application receives 3270 data from CICS and should return valid 3270 data to be converted for the transaction.