I see in document that we can check balance of park document and issue error message if we want. But in SAP standard, we can save park document even if it's not balanced.
In FI, you can control the message number in OBA5. Normally message numbers are issued like this
AA165
First two digits (alpha) is called application area next digits are called message number.
Sometimes, you may not be able to see the messages in OBA5, in such case you need to go to OBMSG transaction code and include the message number to your application area, then you need to come to back to OBA5 to make it information / warning / switch off / error (as the case may be)
Please check if there is any suitable message number if available for parking.
I do not think there are any message for checking the parked document balancing. Because, this is not standard. Therefore, either you need to create a message with the help of ABAPer and then try to restrict in OBA5.
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