Model, SQL: Some minor change for bug fix in SQL export/load.

src/Model/BoundaryCondition/BoundaryCondition.py

@@ -16,7 +16,7 @@ class BoundaryCondition(SQLSubModel):
         self._status = status
 
         if id == -1:
-            self.id = type(self)._id_cnt
+            self.id = BoundaryCondition._id_cnt
         else:
             self.id = id
 
@@ -27,7 +27,7 @@ class BoundaryCondition(SQLSubModel):
         self._header = []
         self._types = [float, float]
 
-        type(self)._id_cnt = max(type(self)._id_cnt + 1, self.id)
+        BoundaryCondition._id_cnt = max(BoundaryCondition._id_cnt + 1, self.id)
 
     @classmethod
     def _sql_create(cls, execute):