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Hello, could anybody explain Validate Fields function with Multipage?
Should I put that function on each page? what would be the Data provider then? What if there is data_read function working?
Should I put the fields list for the certain page?
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You should use it to validate the data on the particular page that just got submitted.

ok. what is the Data provider if there is Read_data function before?

that doesn't make any difference. You're not validating what's in the database you're validating that the user entered in the right stuff to the fields.