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AD update schema error

Hi Experts,

We have exported AD sync project from Synchronization editor and imported it to on new environment.

After importing it, we have updated connection details to Target system for  new Active Directory then we are trying to update schema.

We are receiving below error while updating AD schema after changing connection details in new setup.

Error updating schema of system connection (Active Directory Service (Root DN dc=xxx,dc=xxx))!
The element (ms-Exch-Extension-Attribute-1) cannot be removed from list (Properties) of object ( (contact)) because is it still being used by other elements.

Property mapping rule: Attribute extension 01 <-> ms-Exch-Extension-Attribute-1

Please help us to resolve this ASAP.

one IM 8.0