diff --git a/HEZON_ITK/bs_sap.cpp b/HEZON_ITK/bs_sap.cpp
index f5900fa..b4ef9b7 100644
--- a/HEZON_ITK/bs_sap.cpp
+++ b/HEZON_ITK/bs_sap.cpp
@@ -203,7 +203,7 @@ void get_bom(System::Collections::Generic::List<System::Collections::Generic::Di
 		pid = pid.length()>0?pid:id;
 		int index = pid.find('-');
 		if (index != -1)
-			pid = pid.substr(index + 1);
+			pid = pid.substr(0,index);
 	}
 	for (int j = 0; j < line_cnt; j++)
 	{