Pull information from sheets according to a formula result+cell reference

Hello,

I have sheet Estimacion 3, from there the range (A7:A19) gets populated according to cell G3.

In range (I7:I19) I use the following formula to pull data from different sheets within the same workbook:
=IF(OR(U7="",V7=""),"",INDIRECT("'" & U7 & "'!" & V7)) but since I can't seem to pull data from the range
mentioned previously (A7:A19) I have to past special with values into a different column (U7:V19) with the reference
cell that I want to pull the data from.

The question is can I use formula =IF(OR(U7="",V7=""),"",INDIRECT("'" & U7 & "'!" & V7)) to pull data
from range A7:A19 + the cell reference? so that I can avoid past special with values?

New ways of doing it are also welcomed.

Workbook: http://www.filedropper.com/estimacion3

Thanks in advance.

I built a template for a similar problem when trying to create summary sheets. This might be helpful for your problem. Let me know if you have any questions.

Thanks it helped me realize where my mistake was.