Response requests (Finance)

Output messages from IMS require specific responses. IMS commands, broadcast output, message switches, and non-Fast Path transactions defined to IMS as update-inquiry or recoverable-inquiry require a DR2, except replies to all but the last physical or logical page of non-operator, logical-paged MFS output.

Transactions defined to IMS as irrecoverable-inquiry or replies to operator logical-paged MFS output require an exception DR2. Except for the last physical page of a message whose MOD does not specify PAGE=YES, MFS-paged output requests an exception DR2 reply (regardless of how the transaction is defined), because an explicit MFS control or data input must follow each page before another page of output is allowed; otherwise, the message is dequeued.

Fast Path output messages are sent requesting an exception DR2 response regardless of the transaction type. The next input message from the workstation or an RTR command provides acknowledgment that the preceding output has been received and that IMS might dequeue the message.