Doesn’t update the main database in the store
As far as I have studied the course, first you have to make sure the following things are present inside the whole system.
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Make sure that the Main computer in the server room is not the POS for any kind of relationship. Note that if you have more than 1 POS, you must explicitly define relationship of each one of them with the main system.
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Make sure that you have correctly used the joints and primary keys.
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Make sure that you are using correct foreign key imports.
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Make sure that your internet or lan connection between main server and POS is functional and working.
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Do all these things and I hope that you wont be seeing the problem again.