TEXTFilter to work on multiple fields

Hi there,

I have been working on the TEXTFILTER (from MS) and instead of the textbox returning all values when the TEXTBOX is empty, i want it to show the table to be empty till there is a text.

I have been trying to make this work: and got a partial solution from: https://community.powerbi.com/t5/Desktop/Visualisations-blank-until-something-selected-in-a-slicer/td-p/109790

From the suggestion in the above i create a measure:

CUPS_UNI_CHK = if(calculate(distinctcount(TestData[GROUPID]),allselected(TestData[GROUPID]))=1,"Y","N")

and put this as a filter in the visual level filter ( when contain "Y")

With one column

This works when i have only one column: GROUPID ( even this does not work always in the case of "A1", i believe cause of the existence of "A11")

However when i added a 2nd column, for example CODIDIOMA, it works but for some columns like CODCLI it does not work anymore ( see below)

with more then 2 columns

Can anyone explained why it doesn't and how best to resolve this??(pbix file below)

https://drive.google.com/open?id=1couzM85XXfm-bhIgAiEkgbSsi3cR8mU0 

Thanks

Sk