Local APPC transaction discardability versus nondiscardability

The LU 6.2 protocol that you choose for sending a transaction to IMS and the transaction mode (recoverable or irrecoverable) you choose determine if a local APPC transaction is discardable or nondiscardable.

IMS discards a local APPC transaction when it is any of the following:

• A CPI Communications driven application program (without SYNCLVL=SYNCPT specified)
• It is defined as inquiry-only and nonrecoverable
• It is the result of synchronous input from the LU 6.2 application program
• It uses the APPC Sync_Level option NONE

Otherwise, the transaction is nondiscardable. IMS recovers nondiscardable transactions whenever possible; it never recovers discardable transactions.