I have solved it indirectly.
In the LDAP module there is a microflow called: IVK_TestImportRun
This microflow uses a java action called "Ldap.TestImportAllObjectsAndAttributes" to create list of "TestEntity" and list of "TestAttribute" for LDAP users. There is a relation of 2 entities as follows:
TestEntity (1) --- (*) TestAttribute
I created a microflow to initiate IVK_TestImportRun then iterate over List of TestEntity and for each TestEntity iterate over TestAttribute to find the manager attribute. I found that LDAP manager attribute is a distinguisedName pointing to another LDAP user. When the manager attribute is found, I stored sAMAccountName, distinguishedName and manager distinguishedName of LDAP accounts on a non persistent entity for each LDAP user. Then iterate over this list of non persistent entity to search Administration.Account entities with sAMAccountName and when found, queried for another account with Manager's sAMAccountName. Then I set the Administration.Account self referencing relation to point the manager account.