Hi is there any necessary paper to be declared to have an engagement with my partner in Switzerland?
He is a Swiss, living in Zürich, I am Indonesian and working in Singapore as consultant.

No, none at all, however when you do decide to get married it's quite simple, either you go to the Swiss embassy in Singapore and ask the consuil or he goes to the commune office in Zurich and asks. They give you all the infomation required and the documents needed in one go.

Thanks for information !