diff --git a/api/additional_endpoints.yaml b/api/additional_endpoints.yaml
index e02420d..1872050 100644
--- a/api/additional_endpoints.yaml
+++ b/api/additional_endpoints.yaml
@@ -3,3 +3,27 @@
 #            Use plain openapi/yaml syntax, no Cheetah
 #            escaping
 # -------------------------------------------------------------------
+
+
+  /v1/overhead_advances/flat/{flatId}:
+    get:
+      tags: [ "overhead_advance", "flat" ]
+      summary: Return overhead_advances by $flat
+      operationId: additional_methods.get_overhead_advances_by_flat
+      parameters:
+        - name: flatId
+          in: path
+          required: true
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: overhead_advances_by_flat response
+          content:
+            'application/json':
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/overhead_advance'
+      security:
+      - jwt: ['secret']
diff --git a/api/additional_methods.py b/api/additional_methods.py
index e69de29..4fb590d 100644
--- a/api/additional_methods.py
+++ b/api/additional_methods.py
@@ -0,0 +1,17 @@
+
+from db import dbGetMany, dbGetOne, dbInsert, dbUpdate
+from loguru import logger
+import werkzeug
+
+
+
+
+def get_overhead_advances_by_flat(user, token_info, flatId=None):
+    return dbGetMany(user, token_info, {
+            "statement": """
+SELECT o.id ,o.description ,o.amount ,o.startdate ,o.enddate
+  FROM overhead_advance_t o, overhead_advance_flat_mapping_t m
+  WHERE o.id = m.overhead_advance and m.flat = %s""", 
+            "params": (flatId, )
+        }
+    )
diff --git a/api/db.py b/api/db.py
index cbceade..ac2a379 100644
--- a/api/db.py
+++ b/api/db.py
@@ -64,7 +64,7 @@ def execDatabaseOperation(func, params):
 
 def _opGetMany(cursor, params):
     items = []
-    cursor.execute(params["statement"])
+    cursor.execute(params["statement"], params["params"])
     for itemObj in cursor:
         logger.debug("item received {}".format(str(itemObj)))
         items.append(itemObj)
diff --git a/api/openapi.yaml b/api/openapi.yaml
index 953971f..be04a68 100644
--- a/api/openapi.yaml
+++ b/api/openapi.yaml
@@ -1263,6 +1263,30 @@ paths:
 #            escaping
 # -------------------------------------------------------------------
 
+
+  /v1/overhead_advances/flat/{flatId}:
+    get:
+      tags: [ "overhead_advance", "flat" ]
+      summary: Return overhead_advances by $flat
+      operationId: additional_methods.get_overhead_advances_by_flat
+      parameters:
+        - name: flatId
+          in: path
+          required: true
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: overhead_advances_by_flat response
+          content:
+            'application/json':
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/overhead_advance'
+      security:
+      - jwt: ['secret']
+
 components:
   securitySchemes:
     jwt: