Which version of FDMEE are you using?

There is a functionality called Accounting Entity Group where you can create a group with all Ledgers. If all ledgers have the same segments you can create a common import format and then in the data load rule you select the accounting entity group

Then have a look to what I said.

Accounting Entity Groups can be configured in source accounting entity page

Have a look at admin guide section Working with Source Accounting Entity Groups

Francisco A already provide you the correct answer.

Note also there were quite a few bugs on that base version FDMEE, hence you may want to consider applying the applicable patches(FDMEE is now at 11.1.2.4.210)

Once you got the clarity you needed remember to mark the thread as answered so members can focus on unanswered questions.

Did Your Question Get Answered in My Oracle Support Community (Doc ID 1180503.1)