Is there any way to control that credit amount used in a journal entry does not generate a negative

Hi,

I have a question about using Commitment Control in General Ledger (PSFIN v9.2)

We only have expenditure budget defined.
We do NOT have revenue budget defined.

Scenario detail:
I have an account "X" with a planned budget amount of $100. (No tolerances defined)
Pre-encumbrace amount=$0
Encumbrace amount=$0
Expense amount=$45
So, the available budget amount for account "X" is $55  [ $100-($0+$0+45) ]

Transaction 1 (no problem with this transaction):
I use account "X" in a journal entry in General Ledger with a DEBIT amount = $15. After executing commitment control the updated amounts are:
Pre-encumbrace amount=$0
Encumbrace amount=$0
Expense amount= $60 =($45 + $15)
So, updated available budget amount for account "X" is $40  [ $100-($0+$0+60)]