I need to get items from my list where multiLookup field contains value (for example, value is 42) or has no values. First part is simple:
<Eq> <FieldRef Name='mlookup' LookupId='true' /> <Value Type='Integer'>42</Value> </Eq>
Problems in second part.
I tried to use
<IsNull><FieldRef Name='mlookup' /></IsNull> but it falls with ArgumentException ("Value does not fall within the expected range.")
Is there any solutions for my problem?
Thanks in advance.