Please edit it, making it sound professional:
applicable only in the condition that one or both sides are organizations overseas or individuals.

Another question:

(The following headline is for an agreement, which refers to that a man trusts an agency to buy a building property. The question is whether the headline is proper)

Authorization Agreement on Property building property.
Hi Jobb,

1. 'Only applicable where either or both sides are overseas organisations/individuals'

2. I think I'd title it: 'Agreement for Authorisation', and let the document itself contain the details of what the agreement is for.

All the best,