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CPF4787 - Output length with messages not valid for 3270 API header length. ( OS/400 )

CPF4787 - Output length with messages not valid for 3270 API header length. ( OS/400 )

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Message : CPF4787
Output length with messages not valid for 3270 API header length.

Message Long Text :

Cause . . . . . : An application program using the Systems Network Architecture 3270 application program interface (SNA 3270 API) must provide a 20-byte SNA common header in the first 20 bytes of each output buffer and 8 bytes for messages. The output length was less than the 20-byte header length plus the 8-byte message length.
Recovery . . . : Specify the required 20-byte common header and 8-byte message. Change the output record length in your program.
Technical description . . . . . . . . : 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 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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