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I am writing a program to enroll students and &nbsp;I'm having a big problem. i am using a datamodule in which I put all my tables. If I enroll students i alter my course and student table. They are linked on each other with a nr ( key in student) Student is the master table. When i couple 2 Dbnav on these tables and there is more than one course for one student I get an EInvalidGridOperation =&gt;&gt; Grid index out of bounds/date/invalid. I solved this by putting two table componenets on the form where this is necessary and now it works. What causes this problem???<br />
Please help me, it's for my final report....<br />

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I am writing a program to enroll students and  I'm having a big problem. i am using a datamodule in which I put all my tables. If I enroll students i alter my course and student table. They are linked on each other with a nr ( key in student) Student is the master table. When i couple 2 Dbnav on these tables and there is more than one course for one student I get an EInvalidGridOperation =>> Grid index out of bounds/date/invalid. I solved this by putting two table componenets on the form where this is necessary and now it works. What causes this problem???
Please help me, it's for my final report....


Grid problems

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