Excuse me
I face another problem
The expression in field"deen" in query "Q1" work's wrongly ,if I use this case
Customer1 his transaction as following
1.in 1-1-2016 invoice no-1- amount (10£)
2.in 1-3-2016 he paid (11£)
3.in1-4-2016 invoice no-2- amount (10£)
another invoice At the same...