PC/3270 Response
PC/3270 checks the Query Reply ID and Type (not DOID) and the length.
If they are valid, then PC/3270 returns an ACK message:
WM_DDE_ACK(wStatus, aSFCOND)If PC/3270 cannot perform the Set Structured Field Service Condition function, then PC/3270 returns a negative ACK message containing one of the following return codes in the low-order byte of wStatus:
| Return Code | Explanation |
|---|---|
| 1 | PS SF ID is not valid. |
| 2 | Length is not valid. |
| 3 | One DDM base type is already connected to this session. |
| 4 | Structured Field Service Condition is already set. |
| 6 | The specified format is not valid. |
| 9 | A system error occurred. |