U19s instead of U20s in Italy

I did a lot of editing in order to have U19s teams in place of U20 in Italy.

I edited each team so that he has U19 team instead of U20 team as Reserve team to create (I had to do this for all teams in Serie A, B, C and for a the team of San Marino Academy):

Then I changed each U20 Tournament in Italy to U19:

Then in Advanced rules I changed all the Reserve teams to create:

I edited selection rules as they are IRL:

And switched the U20 Tournaments to U19 also in Advanced rules:

Unfortunately it didn't work out, I get an error message when I try to validate the Advanced rules.

I would create the Youth competitions from scratch, however they are connected to Youth Leage and Carnival Cup and I don't know how to do it.

Please find attached the file of my editing. I am open to suggestions.