Limit on arrears @ dba level

My organization has a rule that we will take no more than one extra deduction if in arrears.  For example, if a an associate goes out on STD without pay for three pay periods therefore their insurance deduction go into arrears (lets say 50$ x 3  = 150.00$ in arrears), we will take 100$ max to catch them up.  Since one associate can have a 50$ deduction and another 100$,  etc. we accomplish setting the limit per pay period on the dba instruction per each associate.  What I would like to know, is am I doing this the hard way.