Total for a field
Hi. I have one parent record with many child records. I need to count the sum of a field in child records.For example, I have a customer record. Then, the customer have many payments record. There's a field named Amount paid in the child records. Now, I have to count the sum of the field 'amount paid' of a customer How can I do this? I've created the relationship. All are going well except for this. Is there any calculation for this?
Thanks in advance :D