Solved DlookUp not working

it's because on New record, there is No athltID yet, try this:

=Dlookup("Onoma", "tbl_Tmimata", "tmimaID = " & Nz(DLookUp("tmimaID","Tbl_StelehosiTmimaton","atheltID=" & Nz([atheltID], 0)), 0))
 

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