Possibly originated from this conference:

The Second Brussels Conference on "Supporting the Future of Syria and the Region" took place on 24-25 April 2018. It was hosted by the European Union and co-chaired by the United Nations

Primary sponsors indicated in:

Clause 3:

"3. The former co-chairs of Brussels I: Germany, Kuwait, Norway, Qatar and the United Kingdom (UK) brought substantial input to the preparations and the proceedings of the Conference. Jordan and Lebanon were closely associated, in a spirit of partnership and in full acknowledgement of their tremendous efforts since the beginning of the Syrian conflict. Turkey also provided important contributions, both as the country hosting the largest number of Syrian refugees and as a key regional actor."

This clause is from point 25:

"Funding decisions shall be conflict-sensitive and shall in no way benefit or assist parties who have allegedly committed war crimes or crimes against humanity."

See:

https://www.voltairenet.org/article200939.html

or the full conference declaration.

How it became a UNSC adopted position is unclear.