On the Onselect action within DataTable1 I have this piece of code:
Set(SelectedRecord,DataTable1.Selected.'PR #');EditForm(FormDetails);Navigate(FormDetails,ScreenTransition.None),
It does not complain, so I guess this is fine but when I go to Item form my FormDetails it complains with Invalid formula. Expected a value compaible with 'DataSource'.

Really strange since my FormDetails opened last week. Any help is most appreciated.