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CPF4789 - Value on SNA 3270 API header not valid. ( OS/400 )

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Message : CPF4789
Value on SNA 3270 API header not valid.

Message Long Text :

Cause . . . . . : An application program using the Systems Network Architecture 3270 application program interface (SNA 3270 API) must provide a valid data flow value in byte 19 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 . . . : Correct the byte for the data flow in the common header in your program, and attempt the output operation again. Compile your program again if necessary.
Technical description . . . . . . . . : The data flow field in the SNA 3270 API common header is validated for all 3270 API sessions. Valid values are:
LU-LU - 'F0'X
Query reply - 'F1'X
SSCP-LU - 'F9'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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