diff --git a/prisma_config/do.py b/prisma_config/do.py
index 1da889b..ce3730e 100755
--- a/prisma_config/do.py
+++ b/prisma_config/do.py
@@ -5567,11 +5567,41 @@ def get_parent_child_dict(config_interfaces, id2n=None):
             bypasspair_wan_name = id2n.get(bypasspair_wan, bypasspair_wan)
             bypasspair_lan_name = id2n.get(bypasspair_lan, bypasspair_lan)
 
-            if bypasspair_wan_name in used_parent_name_list or bypasspair_lan_name in used_parent_name_list:
-                # used multiple times.
-                throw_error("Bypass pair {0} is using a port that is a parent of another interface:"
-                            "".format(config_interfaces_name),
-                            config_interfaces_value)
+            # Check if ports are already used, but allow if they're used by another bypass pair
+            # (since one will be removed - default bypass pairs are removed if user specifies config)
+            wan_conflict = bypasspair_wan_name in used_parent_name_list
+            lan_conflict = bypasspair_lan_name in used_parent_name_list
+            
+            if wan_conflict or lan_conflict:
+                # Check if the conflict is with another bypass pair (which will be removed)
+                # or with a non-bypasspair interface (which is a real conflict)
+                conflict_is_bypasspair = False
+                if wan_conflict:
+                    existing_children = parent_if_map.get(bypasspair_wan_name, [])
+                    if existing_children:
+                        # Check if the existing child is a bypass pair
+                        for child_name in existing_children:
+                            child_config = config_interfaces.get(child_name, {})
+                            if child_config.get('type') == 'bypasspair':
+                                conflict_is_bypasspair = True
+                                break
+                
+                if not conflict_is_bypasspair and lan_conflict:
+                    existing_children = parent_if_map.get(bypasspair_lan_name, [])
+                    if existing_children:
+                        for child_name in existing_children:
+                            child_config = config_interfaces.get(child_name, {})
+                            if child_config.get('type') == 'bypasspair':
+                                conflict_is_bypasspair = True
+                                break
+                
+                if not conflict_is_bypasspair:
+                    # used multiple times by non-bypasspair interface - real conflict
+                    throw_error("Bypass pair {0} is using a port that is a parent of another interface:"
+                                "".format(config_interfaces_name),
+                                config_interfaces_value)
+                # If conflict_is_bypasspair is True, allow it - the other bypass pair will be removed
+                # We still add the ports to the list to prevent further conflicts
 
             # no duplicates, update parent map (bypasspairs many parent, one child).
             parent_if_map[bypasspair_wan_name] = [config_interfaces_name]