what I meant to say is:
I have this and it works great:
=DLookUp("[03_END_PREP].[END_PREP_DESC]","03_END_PREP","[PDS_PREP] = '" & [PREP_A_subform] & "'")
I tried this and it doesn't work (I can't explain why):
=DLookUp("[10_OPTION].[OPT_DESC]","10_OPTION","[PDS_OPT_NUM] = '" &...