Open item management - not all items OI managed on account

[Former Member]

Hi together,

we just have activated successfully open item management afterwards via FAGL_ACTIVATE_OP. On all of those accounts there only exist OI managed items after using this transaction.

But we have doubts regarding an older account. It seems like on this account OI Management already had been activated since creating. At least I can't find any OI posting afterwards like it is shown in line items after using FAGL_ACTIVATE_OP.

Curiously you can find on this account OI managed bookings from 2017-2018 (green and red boxes) and some older postings without OI management from 2013-2014 (green hooks).

What could be the reason for this phenomenon ?

Is it possible to have normal postings and OI managed postings on same account ?

Is there anything we could do to change those not OI managed postings afterwards ?

Best regards