Module Pool- Chain & Endchain

Chain & Endchain use for validation of field .

Sometimes we want to check several fields as a group. To do this, include the fields in a FIELD statement, and enclose everything in a CHAIN-ENDCHAIN block.

Example **** Screen flow logic: ****

CHAIN.

FIELD: SPFLI-CARRID, SPFLI-CONNID.

MODULE CHECK_FLIGHT.

ENDCHAIN.

When an error is found inside a chain, the screen is re-displayed, and all fields found anywhere in the chain are input-enabled. All non-chain fields remain disabled.

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