In Swedish and Finnish Business Central there is a feature called Automatic account codes. When you enter this code in a G/L account postings to this account generate extra posting lines according to the code.

Suggestion: Add allocation account to the G/L account card. Make the allocation account handle both positive and negative allocations (just like the automatic account code)

Example: Customer posts an invoice for pension cost in account no 1111. They know that this posting will later generate social taxes with 24% of the amount. The allocation account in the g/l account can then create an accrual of 24% to one account and post cost of same amount to other account.