PostgreSQL Stored Procedure does not appear on Power BI Dataset refresh screen

Hello,

We have several PostgreSQL stored procedures/functions that we can see on the database. However, when we try to choose them from the screen where dataset is ready to be refreshed, I don't see any of those procedures that we have got on the database. I can see several Public stored procedures; but none that we migrated from MS SQL to PostgreSQL database. Any clue, why?