Date Invoice Paid Off

[hungtran817]

We used crystal reports for some of our GP's reports. The previous person in my position wrote a payments and invoice report for our AR dept. One of his formula contain a condition that required this field "DINVPDOf" in the RM20101 table to update. I noticed some of dates of that field wasn't updating.
I was just wondering how,when or what will update that field?

Thanks,

GP 7.5