ID:22749 Unable to determine preserved clock tree for signal <source>. To specify the intended clock region, a Clock Region assignment can be applied to the source in the original compile.

CAUSE: Preserved clock tree routing was ambigious for the specified source possibly due to the presence of one or more referenced destinations.

ACTION: Modify the design to resolve the ambiguity, either by removing any referenced destinations of the source, or by applying a Clock Region assignment in the original compile.