Assets or Liabilities

Hi,

I've build a Balance Sheet that is not build from a snapshot but all the transactions.

I have ledger accounts that can be assets when then the sum value end of period is positiv or liabilities when the sum value end of period is negativ.

At this moment a negative sum value is an asset and when i say (IF Statement) positiv is asset and negativ is liability then all transactions are treated seperatly, which is not wat i want.

First must be calculated what the endvalue is en then sorted to asset (positiv) or liability (negativ).

How can i achieve this?

Thank you in advance

Marcel