How add multiple predicates in expresion

Summary:
How add multiple predicates in expresion

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Hi experts,

I try to combine two predicates, it does not throw an error but it does not return any information either, the expression is the following:

$readReport/nsmpr7:ReadResponse/ns36:DATA_DS/ns36:CUSTOMERS_DATA[1] [ns36:NUMERO_DE_CLIENTE= $curr_customer/nsmpr1:Data/nsmpr1:Customer ]/ns36:NUMERO_DE_CLIENTE

If I put them separately, either like this:

$readReport/nsmpr7:ReadResponse/ns36:DATA_DS/ns36:CUSTOMERS_DATA[ns36:NUMERO_DE_CLIENTE= $curr_customer/nsmpr1:Data/nsmpr1:Customer ]/ns36:NUMERO_DE_CLIENTE

or like this:

$readReport/nsmpr7:ReadResponse/ns36:DATA_DS/ns36:CUSTOMERS_DATA[1]/ns36:NUMERO_DE_CLIENTE