Hi Michal,
I looked into your query and could confirm that the options in note 1547977 can be used for your case.
In fact, this is one limitation in ECC side that the application needs a company code to work while creating/replicating central contract.
So if you do not want to maintain company code for the ECC organization with trx OX01, please refer to
the two options in note 1547977--Q6.
Ivy