Hi, I’m creating a website that sells training courses and I have a numeric custom field for every course… something like “Course Ref”.
This “Course Ref” field is used to identify a specific course, so it’s really important that it’s filled with the right value. So, when the administrator create a new course and fill all its data from backend, I’d like to show a notice if the value for “Course Ref” has been already used for another course.
Just to be more clear: this field value MUST NOT be unique… it CAN be used in other courses. But in that case a notice warning should be displayed, just to make sure that the numeric value is the right one.
Can someone please help me? Thanks in advance!
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