+// exception for patterns
+#define INVALID_REFBLOCK_USE 10001
+#define INVALID_DELTA_CP 10002 // delta and CP are not consistent (NB: used during admittance computation)
+
+#define EVAL_PARAM_UNKNOWN 10101 // a variable used in an expression is not defined as a block parameter
+#define EVAL_PARAM_NOVALUE 10102 // can't get the double value of a block parameter
+#define EVAL_INVALID_EXPR 10103 // invalid arithmetic expression (in a block parameter/pattern)
+
+#define INVALID_IFACE_PATTERN 10201 // the pattern of an interface is invalid (not correct grammar)
+#define INVALID_IFACE_PC 10202 // the production counter of an interface is invalid (not correct grammar)
+
+#define INVALID_IFACE_CP_LENGTH 10301 // the size of CP for an interface differs from others
+#define NO_IFACE_CP 10302 // an interface has no CP defined in reference block
+
+#define INVALID_IFACE_PP_LENGTH 10401 // the size of PP for an interface differs from others
+#define NO_IFACE_PP 10402 // an interface has no PP defined in reference block
+
+#define NO_IFACE_IP 10501 // an interface has no IP
+#define IP_AP_NOTCOMPAT 10502 // IP and AP not compatible
+#define IP_END_NULLCOL 10503 // IP ends with anull column (normally not possible during compat. check)
+#define AP_TOO_SHORT 10504 // AP has been badly computed, leading to a AP shorter than needed (NB: it is an abnormal case)
+
+
