PO UDF Not Available for data entry

I have a series of UDF’s that I use in PO data entry to capture added shipment and related data.  I have the UDF’s on a 5th tab in PO data entry.  I have had this system in place since 3.71.  I upgraded to 4.50.7.0 in December and since that upgrade the UDF fieldsare grayed out on entry.  Move forward or back and then return to the target PO and they are available.  I had similar problem  in upgrade from 3.71 to 4.x in 2004 and found solution on BestTalk – but that is no longer available and have not found similar problem/solution on current user platform.

i use UDF's in similar fashion in IM and have not had same issue.

Thanks in advance.

Jack