@MaPal93 b2 appears in the assignment to Var_Omega_S. I see many places your subscripts or superscripts or Greek letters are parts of atomic variables, which I suppose is OK, but not the b2. This is a very strange way to use Maple. For example the line
looks like 1-D math but has Omega in. When converted from the right-click menu 2-D math-convert to 1-D math then we get the real 1-D math Omega := subs(repl, `Ωinst`); If I convert that to 2-Math input I get
So you are using 2-D math and formatting it as 1-D math? I guess in that context the b2 is OK, but not sure why you would do this.
I only answered the title part of your question, and do not understand what you are trying to do, which is why I replied to rather than answered your question. Hope someone else can help you with that.