Update SymbolicUtils compat

Author: TorkelE

Project.toml

@@ -56,8 +56,9 @@ Requires = "1.0"
 RuntimeGeneratedFunctions = "0.5.12"
 Setfield = "1"
 StructuralIdentifiability = "0.5.1"
-SymbolicUtils = "1.0.3"
 Symbolics = "5.27"
+SymbolicUtils = "2.0.2"
+TermInterface = "0.4.1"
 Unitful = "1.12.4"
 julia = "1.10"
 

src/reactionsystem_conversions.jl

@@ -560,7 +560,7 @@ function nonlinear_convert_differentials_check(rs::ReactionSystem)
         # If the contenct of the differential is not a variable (and nothing more).
         # If either of this is a case, throws the warning.
         if Symbolics._occursin(Symbolics.is_derivative, eq.rhs) ||
-                !iscall(eq.lhs) ||
+                !Symbolics.is_derivative(eq.lhs) ||
                 !isequal(Symbolics.operation(eq.lhs), Differential(get_iv(rs))) || 
                 (length(arguments(eq.lhs)) != 1) ||
                 !any(isequal(arguments(eq.lhs)[1]), nonspecies(rs))