Expressions: multiple conditions

[Guido1982]

Follow the previous post I created a validation map that evaluates a condition expression map. I want to trigger the validation only when a certain picklist value is selected, so

Code:

if (pending_tc_recordcount > 0 && lm_status = 'thetriggeringstatus') then 0 else 1 end

But that doesn't yield the desired result (I get some fatal error). Is this even possible and if so, how? And if it's not, is there another solution, other than writing a custom validation?