I was going to link placing of formwork for footings and then placing of reinforcing steel. Now, I said that the reinforcing steel should start 2 days after formwork started. Because realistically after the forms start, you can start the steel while the forms are still going. And I wrote that relationship as SS+2. But I also wanted to say that the steel can only finish after formwork finished. So I also wanted to write FF to the predecessor of steel, in addition to SS=2 I wrote before. But it didn’t allow me and said I can not link the same activity twice. How can I tell the program that the reinforcing steel needs to start 2 days after the forms start, and it can only finish after the forms are finished?