Store Procedure required to check Quantity total

Dear Experts,
Kindly help me in writing Store Procedure, my requirement is to have an validation on Inventory Transfer Form where i have created two udf fields in row level as A & B contains where user enter value which is calculated as A * B that is equal to total Quantity, for ex. (A * B = Quantity).
So i need here a validation check before adding this document, that Field A value multiply by Field B value that should to be total Quantity in case changes made in field A or Field B but not update before saving this document it would result be wrong Quantity total.
To avoid such user entering mistakes a SP is required to check whether the Quantity total is equal to Field A value * Field B value.
Thanking in Advance....
Regards,
Krishnakumar

Hi! Gordon,
Already there is an FMS to Calculate Field A value * Field B value and it through it's result to the Field Quantity. Now am looking to have an validation check or control that should actually check before document get saved that the value entered in Field value A multiply by Field value B is that get tallied with the Field Quantity.
For ex: Field A value contain figure 100 and Field B value contain figure 200 then the Field A * Field B = Quantity i.e. (100 * 200 = 20,000). In case if the user change the field Value of A or B without updating the Field Quantity then it result in correct Quantity.
So I need a Store Procedure that check the field value of A & B and check the product sum Field value Quantity if it matches then it should allow to save the document other wise it should print a Error message "Calculation Error".
I hope you understand what am exactly required, so i need your helping hands to get this Store Procedure.
Thanks in Advance,
Regards,
Krishna
Edited by: krishnaoctopus on Jun 14, 2011 2:49 PM

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*** ON THE CLIENT:
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