Could not delete from specific table

[willy292]

Query4 is the result from left joining of Query3 and Query1
and I would like to delete some of the null data in query 4

while I execute the following code
DELETE DISTINCTROW Query4.*, [working hour] AS Expr1
FROM Query4
WHERE (((query4.[working hour])=0));

I get the warning of "Could not delete from specific table"

can anyone help, thanks.

[pbaldy]

At a guess, query4 is read only:

http://allenbrowne.com/ser-61.html