Balance Sheet Closing Balance calculation in Business rule

Summary:

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To calculate the Opening balance for the current month, we have a business rules that takes the prior month OB pluss mnthly movemnent plus adjustments. I'm curious if this is best practice? Why wouldn't we just have a rule to take the closing balance?

Additionally, I need to move the balances from one location to another. (previously we weren't using location, but now we are)

However, considering how the rule is currently written, I'm not sure the best way to do so. If I move it, and the rule is run, it will just pick up the old location since it is taking OB/MM/Adjs. Any recomendations?