public boolean isViewDataTypeFromOriginalDTM(DataType existingViewDt) {
		if (existingViewDt.getDataTypeManager() != this) {
			throw new IllegalArgumentException("datatype is not from this manager");
		}
		if (!(existingViewDt instanceof DatabaseObject)) {
			return false;
		}
		return dataTypeIDMap.getOriginalIDFromViewID(getID(existingViewDt)) != null;
	}
Determine if the specified datatype which has previsouly been resolved to this datatype
manager originated from original composite's source (e.g., program).  
<P>
NOTE: Non-DB datatypes will always return false.

@param existingViewDt existing datatype which has previously been resolved to this
datatype manager.
@return true if specified datatype originated from this manager's associated original 
datatype manager.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/compositeeditor/CompositeViewerDataTypeManager.java