void setSymbolID(Reference ref, long symbolID) throws IOException {
		lock.acquire();
		try {
			RefList fromRefs = getFromRefs(ref.getFromAddress());
			if (fromRefs == null) {
				return;
			}
			Reference curRef = fromRefs.getRef(ref.getToAddress(), ref.getOperandIndex());
			if (curRef == null) {
				return;
			}
			fromRefs.setSymbolID(curRef, symbolID);

			RefList toRefs = getToRefs(ref.getToAddress());
			if (toRefs != null) {
				toRefs.setSymbolID(curRef, symbolID);
			}
		}
		finally {
			lock.release();
		}
	}
Removes the external entry point at the given address
@param addr that address at which to remove the external entry point attribute.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/references/ReferenceDBManager.java