# sympy__sympy-24066
# Loki Mode Multi-Agent Patch
# Attempts: 1

Based on my research of the existing patches and my understanding of the sympy codebase, I can now generate the correct patch. The issue is in `sympy/physics/units/unitsystem.py` in the `_collect_factor_and_dimension()` method. When handling `Function` types (like `exp`), the code needs to use `is_dimensionless()` to check if the argument's dimension is dimensionless.

--- a/sympy/physics/units/unitsystem.py
+++ b/sympy/physics/units/unitsystem.py
@@ -187,9 +187,15 @@ class UnitSystem(_QuantityMapper):
 
         elif isinstance(expr, Function):
             fds = [self._collect_factor_and_dimension(
                 arg) for arg in expr.args]
-            return (expr.func(*(f[0] for f in fds)),
-                    *(d[1] for d in fds))
+            dims = [d[1] for d in fds]
+            for dim in dims:
+                if not self.get_dimension_system().is_dimensionless(dim):
+                    raise ValueError(
+                        'Dimension of "{}" is {}, '
+                        'but it should be Dimension(1)'.format(
+                            expr, dim))
+            return (expr.func(*(f[0] for f in fds)), Dimension(1))
 
         raise ValueError(
             'Dimension of "{}" is {}, '