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Im not able to add or modify a tax rule

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I have a problem with tax rules on a PS 

When I try to add or modify a tax rules I get this error message: The property TAXRulesGroup->date_add is not valid




I have found similar issues but they are related with old prestashop versions, so I guess it will not work with 1.7 cause they talk about modify tables that are not the same in 1.7.

Please help, thanks

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Find  the  classe   TAXRulesGroup      and  change  th  data  validation  for   date_add    use  a  string  or  just  don't  validate  it.

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