SAVE UNIQUE in MC env

Hi guys
I do have a question.
I need to identify all the SECURITY.MASTER entriey that have a SECURITY.POSITION in a subroutine.
I thought about using EB.READLIST with a SELECT using SAVING UNIQUE SECURITY.NUMBER.

Now my question, we have a mulicompany environment, and I would need to get a unique list of all the SECURITY.MASTER.ID's used over all the MC environments.
how would you do this?

Thanks for your help

cheers

Reto

Which version of T24 you are working?

Have you tried POS.CON.SEC? If you are in newer release like R06 and later, then you may need to use the call API SC.GET.SECURITY.POSITION.LIST

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Thanks