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hello and welcome to lesson 20 of open server in the last lesson we looked at validation alternatives to perform on a safe in this lesson we are going to look at validate on remove the validations we have seen until now are processed when the entity is modified but sometimes its useful or its required to process the validation before the removal of the entity and to use the validation to cancel the entity removal were going to modify the application to reject the removal of an order if its it has an invoice associated to achieve this this were gonna note in the order entity with at remove validator just as were gonna see right now so here in our class order were gonna write the following code remove validator and were gonna put uh this package calm.your company.invoicing.validations and then were gonna create a class when we finish writing the code dot your company dot and voice the name of the class which is going to be order remove validator and then point class to indicate
