Multi-select filtering with drop down on text field type column

[vito924]

Hello everybody!

I am trying to come up with a solution to a dropdown multi-select filter that is going to filter text type column in my details list.
Bellow is the example of a formula that is currently on my details list Items property and actually works if drop down has 2 items selected. If it has 0 it returns this error: "Nested errors not supported in this control property: The 'Index' function cannot be called with an empty table." and if it has only 1 item selected it returns this error: "Nested errors not supported in this control property: The second argument to the index function must be between 1 or 2, the lower and the upper bounds of the table. The upper bounds must be reduced due to the non-delegation limit." If I have more than 2 item selected it doesn't do anything and does not return an error either. Plan is to have 5 selected items possible for filtering.

Is there any idea for the solution to this issue? Any comment would be appreciated.

Filter(
colData,
Index(ddFilterProgramInicijativa.SelectedItems, 1).Name in ProgramInicijativaTO Or IsBlank(Index(ddFilterProgramInicijativa.SelectedItems, 1).Name),
Index(ddFilterProgramInicijativa.SelectedItems, 2).Name in ProgramInicijativaTO Or IsBlank(Index(ddFilterProgramInicijativa.SelectedItems, 2).Name))

Thank you in advance!