Backward Compatibility with Version 4.3a and Older

•	The old Perfectly Matched Layer (PML) node that is located under the physics node has been discontinued. From the next version on, only the Perfectly Matched Layer nodes defined under the Definitions node are supported.

•	In order for the old Perfectly Matched Layer (PML) node to be backward compatible, the PML feature must be placed after any domain Monopole Source, domain Dipole Source, or Background Pressure Field nodes.