Processing ++HOLD and ++RELEASE statements

All message control statements from SMPHOLD are processed in the order in which they occur. (++HOLD contained within SYSMODs that were received are processed when those SYSMODs are processed.) For each ++HOLD and ++RELEASE statement that was selected, SMP/E takes these actions:

For ++HOLD statements, SMP/E adds the reason IDs to the associated global zone SYSMOD entry. If no SYSMOD entry exists, SMP/E builds one that contains just the reason IDs. SMP/E also saves the ++HOLD statement in the global zone. This is called a HOLDDATA entry.
Note: For a given SYSMOD, SMP/E does not save multiple entries or subentries for a given reason ID. This is true except for ++HOLDs that are contained within a SYSMOD. For ++HOLDs that are contained within a SYSMOD, unique HOLDDATA can be created for the same reason ID as long as the SYSMOD ID specified on each ++HOLD is different.
Therefore, uniqueness for a HOLDDATA entry is determined by reason ID and SYSMOD ID specified on the HOLD. For example, assume SMP/E has already received the following ++HOLD statement:
```
++HOLD (UZ12345) FMID(FXY1040) SYSTEM REASON(DOC)
        COMMENT(message XXX123 was changed. enter U to reply.).
```
Later, SMP/E receives another ++HOLD statement for the same SYSMOD, HOLD type, and reason ID, but the comment is different:
```
++HOLD (UZ12345) FMID(FXY1040) SYSTEM REASON(DOC)
        COMMENT(default for xyz command changed to NO.).
```
Information from the second ++HOLD statement replaces the information from the first ++HOLD statement.
For ++HOLD statements with a hold category of FIXCAT, SMP/E translates fix category values into SOURCEIDs and assigns them to the resolving (fixing) PTFs identified on the HOLDDATA, if those PTFs are already received. A PTF must have been previously received, either during a previous RECEIVE command or the current RECEIVE, in order for the FIXCAT SOURCEID to be assigned.
For ++RELEASE statements, SMP/E removes the specified reason ID from the global zone SYSMOD entry and deletes the ++HOLD statement for that reason ID from the global zone.