I have 2 Lists (one to list the combobox, list non-repeated data and the other from SharePoint which stores all the content of the inserts)
What I want to do is that the apps application does not allow me to register the same number of machines more than 3 times in a period of 6 months (maximum 2 times is needed)
When mentioning "register" consider that the user lists the combo and selects the machine number of interest and the other data (Text entry) the user types it
I should mention that my en list has a machine date field.

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