Single GL Journal has two BSV

1- One GL with two BSV. BSV 256 maps to OU = A and BSV 515 maps to OU = B

2- A security profile is created and both OUs assigned to it

3- This security profile assigned to AR responsibility (through MO: Security Profile)

4- Creare Accounting request ran from this AR responsibility

5- GL Journals created have lines with BSV = 256 and other lines with BSV = 515

My questiuon is how to get GL create a separate journals for each BSV (i.e., all lines within a single journal have single BSV). Is there a ledger or profile option or it's a matter of security profile?