Show other field in Text acoording the selected filter

[thiago_alessand]

Good morning,

How can I do to show a result according to the selected filter?

Example: I selected a determinate provider and i need show the provider's code in a text box.

I tried 

IF(GetFieldSelections(FORNECEDOR) = FORNECEDOR, CodFornecedorRG) 

where the field 'FORNECEDOR' it's the same as 'Provider' and 'CodFornecedorRG' it's the same as 'Provider's Code', but it's not working.

Any idea?

PS: Sorry for my English doesn't help you so much.

Thanks

[sunny_talwar]

Would you be able to explain your scenario with an example?

[dwforest]

are FORENECDOR and 'Provider' different fields or 'Provider' is what FORENECDOR contains?
If they are the same, you'd simply use =CodFornecedorRG assuming the CodFornecedorRG value is in or related to the table containing FORENCEDOR
Filtering all related data to current selections is the basic functionality of Qlik