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BACKOUT Verb Issued Locally

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Image that shows how the BACKOUT verb is issued locally.
BACKOUT verb issued locally.

  1. The local transaction program issues a RECEIVE_AND_WAIT or MC_RECEIVE_AND_WAIT verb (depending on whether a basic or mapped conversation is being used) to receive data from the remote transaction program. The vendor API passes the verb transparently to Host Integration Server.

  2. The RECEIVE_AND_WAIT or MC_RECEIVE_AND_WAIT verb completes with the what_rcvd field of the VCB set to AP_PS_HEADER. The data buffer contains a PREPARE PS header.

  3. Another RECEIVE_AND_WAIT or MC_RECEIVE_AND_WAIT verb is issued by the vendor API to receive the send indication from the remote TP.

  4. The vendor API returns the transaction program's RECEIVE_AND_WAIT or MC_RECEIVE_AND_WAIT verb with the what_rcvd field of the VCB set to TAKE_SYNCPT.

  5. The transaction program issues a BACKOUT verb to back out the transaction.

  6. The vendor API generates a SEND_ERROR or MC_SEND_ERROR verb of type BACKOUT_RESYNC to send the Backout sense code 0x08240001.

  7. The vendor API then issues a CONFIRM or MC_CONFIRM verb to flush the SEND_ERROR or MC_SEND_ERROR verb and request a response from the remote transaction program.

  8. The CONFIRM or MC_CONFIRM verb completes when the remote transaction program issues a CONFIRMED or MC_CONFIRMED verb. The vendor API then returns the BACKOUT verb to the local transaction program.