R78 - Transaction Validation

I am using R78.

 

We want to prevent receipt transactions taking place where the standard cost is 0.

 

On Green Screen, we amended the transaction edit program to put out an error to the screen.

 

I want to do the same in Materials Management.

 

I have activated the user exits UXTAVK0R etc  from the Inventory history object but cant work out

where to put the error message code if there is no standard cost.

 

I know that the user exits are called when I do a Purchase Order Receipt.

 

Can anyone point me in the right direction?

 

Thanks

 

Roger

 

 
 		 	   		  
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