Structure alter processing is supported only by SP 5.2, and is available based on connection attributes specified on IXLCONN. When a connector tries to connect to a structure that is being altered, the following actions occur depending on whether the connector is on a 5.1 or 5.2 system:

• SP 5.1 connector

  XES rejects the IXLCONN request with return code IXLRETCODEPARMERROR, reason code IXLRSNCODECONNPREVENTED.

• SP 5.2 connector

  If the SP 5.2 connector does not allow structure alter (ALLOWALTER=NO), XES rejects the IXLCONN request with return code IXLRETCODEPARMERROR, reason code IXLRSNCODESTRALTERNOTALLOW.

  If the SP 5.2 connector allows structure alter, XES compares the threshold values specified on IXLCONN (RATIO, MINENTRY, and MINELEMENT) with the composite limits for the structure being altered:

  • Connections with more restrictive limits than the current composite are rejected with return code IXLRETCODEPARMERROR, reason code IXLRSNCODESTRALTERRESTRICT.
  • Connections with the same or less restrictive limits than the current composite are connected to the structure. The connector must examine the connect answer area to determine whether structure alter is in progress (CONAALTERINPROGRESS) and if so, check CONAALTERINFO for target and composite information.