BPE header format

The BPE header is a recurring structure in messages that are handled by IMS Connect.

The following table lists the fields in the BPE header layout. This topic contains Product-sensitive Programming Interface information.

Table 1. BPE header layout
Field Length Meaning
llll 4 bytes The length of the total structure and it is set for the first BPE header only. This field is managed by IMS Connect and must not be altered by the exit.
CHAIN PTR 4 bytes The chain pointer to the next BPE header within this message. The last BPE header in the message must have binary zeros as a chain pointer value to denote the end of the BPE headers within the message.

These chain pointers are set by the user-written client application exit routine.

STORAGE TYPE 8 bytes This field is managed by IMS Connect and should not be modified by the user exit.
TYPE ACCESS 4 bytes This field is managed by IMS Connect and should not be modified by the user exit.
SUBPOOL 1 byte This field is managed by IMS Connect and should not be modified by the user exit.
Reserved 43 bytes This field is managed by IMS Connect and should not be modified by the user exit.