Can I modify the the day type with a time rule???

Hello,

I´m trying to modify the day type,I want to change in some particular cases the day type from 1 to 0 for example. I´m looking in the documentation but I don´t find no operation to do this trough a time rule.

I think that it would be abble to do with a function that modify the table PSP.

Anybody knows how can I do it??

Thank you very much!!!.Regards,

Emi DF