Mapping two source fields with the same Idoc segment

Hi,

I need mapping two source fileds (are two nodes with four fileds everyone) with the same idoc segment:

The two nodes are mandatory:

And this is the idoc segment:

The mapping with the firts node is ok and the result is:

Always always come the four  nodes (taxData) filling.

My probolem,  I need  other segment with the values of node  incometax (first screenshot), how do I can get this?

Thanks in advance

Regads

Mónica