I received a solution - the macro call has to be enclosed in parantheneses.
It seems this is necessary when the output data is within a conditional
block, e.g.

#macro A(B) #if(B=B) (B) #end #end

Another way to solve the problem is to add parantheneses in the macro:

#macro A(B) (#if(B=B) (B) #end) #end

Still, I would like to know the reason for this behaviour.

Margus

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