Dynamic action Infotype 0041 question

Try to update the dynamic action to remove the "last day worked" date type and date in infotype 0041 record when the rehire action is executed in infotype 0000. The question is how to determine which field, DAR01 thru DAR12, stored the last day worked info since it can be different depending upon how many dates stored in the record for the employee. When I entered the lines below, it wiped out the last day paid info as well. Thanks for the help.

0000 06 111 P PSPAR-MASSN='AD'/X

0000 06 112 P PSPAR-MASSN='AM'/X

0000 06 113 I MOD,0041/D

0000 06 114 P P0041-DAR05='10'

0000 06 115 W P0041-DAT05=SPACE