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I want to restrict no of records in the table on base of user input



I am developing a stock input form. The scenario is as follows

1. I will receive a big packet from company which consist of many items in it. This number can vary. and every item has its own ID.  Now I have input from to receive this packet. 

2. I want to add some logic on the form that when user open the box he will add number of items for example he add 7 itmes. Seven rows on the datapge is automatically created to record their IDs. User should not been able to add more then 7 or even less then seven items, Similarly if user enter 12 number of items the form should allow him 12 enteries not more or less than 12.

please help me in this regard


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