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CPF4788 - 3270 data stream command not valid on SNA 3270 API header. ( OS/400 )

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Message : CPF4788
3270 data stream command not valid on SNA 3270 API header.

Message Long Text :

Cause . . . . . : An application program using the Systems Network Architecture 3270 application program interface (SNA 3270 API) must provide a valid 3270 data stream command in the first byte of the common header. The application program must provide a common header in the first 20 or 32 bytes of each output buffer. The length depends on the format type specified for the EMLDEV parameter.
Recovery . . . : Change the first byte in the common header to contain a valid 3270 data stream command, and attempt the output operation again. Compile your program again if necessary.
Technical description . . . . . . . . : The command field in the SNA 3270 API common header is validated only for formatted 3270 API sessions. Valid command codes are:
Erase All Unprotected - '6F'X
Erase Write Request - 'F5'X
Erase Write Alternate - '7E'X
Read Buffer - 'F2'X
Read Modified - 'F6'X
Read Modified All - '6E'X
Write - 'F1'X
Write Structured Field - 'F3'X
AID with possible data - '00'X
The SNA 3270 API common header is required in all output operations with record length greater than zero.
If the format type unformat (*UNFORMAT) is specified for the emulation device (EMLDEV) parameter on the Add ICF Device Entry (ADDICFDEVE) command, the Change ICF Device Entry (CHGICFDEVE) command or the Override ICF Device Entry (OVRICFDEVE) command then the SNA 3270 API common header provides an indication about whether the data that follows is a 3270 data stream or a user-provided system services control point (SSCP) data flow.
If the format type field (*FIELD), extended field (*EXTFIELD) or no field (*NOFIELD) is specified on the EMLDEV parameter on the ADDICFDEVE, CHGICFDEVE or OVRICFDEVE command, then the SNA 3270 API common header provides information about translating the display or printer data that follows into a 3270 data stream. It must contain information indicating one of the following: the data is an LU-LU data flow, a query reply, or an SSCP data flow.

Message File : QCPFMSG
Library Message File : QSYS2924


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