diff --git a/server/AyaNova/Controllers/WorkOrderController.cs b/server/AyaNova/Controllers/WorkOrderController.cs
index 3894382e..efb4dd0c 100644
--- a/server/AyaNova/Controllers/WorkOrderController.cs
+++ b/server/AyaNova/Controllers/WorkOrderController.cs
@@ -172,6 +172,31 @@ namespace AyaNova.Api.Controllers
 
 
 
+        /// <summary>
+        /// Change existing work order's Contract
+        /// applies new Contract and returns complete updated work order
+        /// </summary>
+        /// <param name="newContractId">new contract id</param>
+        /// <param name="apiVersion">From route path</param>
+        /// <returns>WorkOrder</returns>
+        [HttpPost("contract")]
+        public async Task<IActionResult> ChangeContract([FromBody] long? newContractId, ApiVersion apiVersion)
+        {
+            if (!serverState.IsOpen)
+                return StatusCode(503, new ApiErrorResponse(serverState.ApiErrorCode, null, serverState.Reason));
+            WorkOrderBiz biz = WorkOrderBiz.GetBiz(ct, HttpContext);
+            if (!Authorized.HasCreateRole(HttpContext.Items, biz.BizType))
+                return StatusCode(403, new ApiNotAuthorizedResponse());
+            if (!ModelState.IsValid)
+                return BadRequest(new ApiErrorResponse(ModelState));
+            WorkOrder o = await biz.ChangeContract(newContractId);
+            if (o == null)
+                return BadRequest(new ApiErrorResponse(biz.Errors));
+            else
+                return Ok(ApiOkResponse.Response(o));
+        }
+
+
         #endregion WorkOrderTopLevel routes
 
 
@@ -730,7 +755,7 @@ namespace AyaNova.Api.Controllers
           
         */
 
-        
+
         #region WorkOrderItemOutsideService
 
         /// <summary>
@@ -827,7 +852,7 @@ namespace AyaNova.Api.Controllers
 
         #endregion WorkOrderItemOutsideService
 
-      
+
 
         /*
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