diff --git a/LSL2/STPROC/OBJ_REACTOR_LOG.txt b/LSL2/STPROC/OBJ_REACTOR_LOG.txt
index 9e0675d..792b654 100644
--- a/LSL2/STPROC/OBJ_REACTOR_LOG.txt
+++ b/LSL2/STPROC/OBJ_REACTOR_LOG.txt
@@ -138,7 +138,8 @@ PostReactItems:
 			    ValidationFailureReason = 'Unable to install Reactor Item No. ' : InstRINo : '. Serial Number cannot be blank to non-elevator Reactor Items.'
 		    end
 		end
-		If (InstRIRec<REACT_ITEM_PART_TYPE$> NE ReactorType) then
+		// Only check first three characters so that ASM parts can be installed in an ASM+ reactor
+		If (InstRIRec<REACT_ITEM_PART_TYPE$>[1, 3] NE ReactorType[1, 3]) then
             ValidationFailureReason = 'Unable to install Reactor Item No. ' : InstRINo : '. Reactor Type must match Reactor Item Part Type.'
 		end
 	Until ValidationFailureReason NE ''	
@@ -408,5 +409,3 @@ RemHistKeys:
 	
 RETURN
 
-
-