error in "FIND" function

Hi,

I'm having issues with text funciton "find".

I use it to partition string into columns (to create table with couple of additions later)

The expression is Pandl_key2 = ADDCOLUMNS( SUMMARIZE(data;[pandl]);
                                                                                      "test";FIND("-";[pandl];1)+4
                                                                                       )

I'm getting error "The search Text provided to function 'FIND' could not be found in the given text."

I'm sure, the "-" mark is in my text, I used same expression before on same dataset and it was working.

Thanks for any ideas,

Zuzana