syntax in query expression #ERROR help!

[manos39]

i have a query (Qrminas) to calculate a running sum of workhours of empoyees per month and i get #error in the field ΣΥΝΟΛΑ

SELECT Qrevdomada.[ΑΝΑ ΕΤΟΣ], Qrevdomada.[ΑΝΑ ΜΗΝΑ], Qrevdomada.ΥΠΑΛΛΗΛΟΣID, Qrevdomada.ΕΠΩΝΥΜΟ, Sum(Qrevdomada.[ΔΙΑΦΟΡΑ ΣΕ ΩΡΕΣ]) AS [ΣΥΝΟΛΟ ΜΗΝΟΣ], DSum("[ΣΥΝΟΛΟ ΜΗΝΟΣ]","Qrevdomada","[ΑΝΑ ΜΗΝΑ] <= " & [ΑΝΑ ΜΗΝΑ] & " And [ΑΝΑ ΕΤΟΣ] <= " & [ΑΝΑ ΕΤΟΣ] & " And [ΥΠΑΛΛΗΛΟΣID] = '" & [ΥΠΑΛΛΗΛΟΣID] & "'") AS ΣΥΝΟΛΑ
FROM Qrevdomada
GROUP BY Qrevdomada.[ΑΝΑ ΕΤΟΣ], Qrevdomada.[ΑΝΑ ΜΗΝΑ], Qrevdomada.ΥΠΑΛΛΗΛΟΣID, Qrevdomada.ΕΠΩΝΥΜΟ;



[ΑΝΑ ΕΤΟΣ]= year date field
[ΑΝΑ ΜΗΝΑ] = month date field
[ΥΠΑΛΛΗΛΟΣID] =employeeid
[ΕΠΩΝΥΜΟ] = surname
[ΔΙΑΦΟΡΑ ΣΕ ΩΡΕΣ] = totals per week

can you help? i believe it is the syntax
i upload my db

[pbaldy]

Your data types are off, and I don't see the field being summed in that query. This produces results, with a field picked at random:

ΣΥΝΟΛΑ: DSum("[ΘΕΩΡΗΤΙΚΕΣ ΕΒΔΟΜΑΔΑΣ]","Qrevdomada","[ΑΝΑ ΜΗΝΑ] <= '" & [ΑΝΑ ΜΗΝΑ] & "' And [ΑΝΑ ΕΤΟΣ] <= '" & [ΑΝΑ ΕΤΟΣ] & "' And [ΥΠΑΛΛΗΛΟΣID] = " & [ΥΠΑΛΛΗΛΟΣID])