An ispec transmitted with its Maint built-in attribute set to BAC recalls the previous database record (the ispec record with the next-lowest key value to that specified).
This recall function does not change any values in the database record, including the value of the Maint attribute.
Restrictions
The following restrictions apply to the use of BAC:
It is only valid if the ispec's Auto Recall property is set to true.
It is not valid if the ispec has a persistent key that does not appear in the user interface.
The following restrictions apply to the transmitted key:
A key value must be specified.
Number validation is performed, therefore decimal points or separator characters (if required) must be included for number-primitive keys.
Trailing zeros must be included if the key contains decimals.
Where the key is also a keyword, leading zeros must be entered for number-primitive variables.