Added a signoff line type of checkoff to Abnormal sub-format 00

PROMS/fmtxml/FmtFileToXml.cs

@@ -4468,6 +4468,9 @@ namespace fmtxml
 				case "EXCLN.X00":
 					AddEXCLN00_OVRfmt(ref fmtdata);
 					break;
+				case "NSPAB.X00":
+					AddNSPAB_X00_OVRfmt(ref fmtdata);
+					break;
 			}
 		}