新增接口：查询退回目标节点信息

src/Hotline.Api/Controllers/OrderController.cs

@@ -4503,6 +4503,26 @@ public class OrderController : BaseController
         return rsp;
     }
 
+    /// <summary>
+    /// 查询工单退回目标步节点信息
+    /// </summary>
+    [HttpGet("previous/targetStep/{orderId}")]
+    public async Task<TargetStepInfo> GetPreviousTargetStepInfo(string orderId)
+    {
+        var order = await _orderDomainService.GetOrderAsync(orderId, cancellationToken: HttpContext.RequestAborted);
+        if (string.IsNullOrEmpty(order.WorkflowId))
+            throw UserFriendlyException.SameMessage("该工单未开启流程");
+        
+        var (currentStep, prevStep, isOrgToCenter, isSecondToFirstOrgLevel) = await _workflowApplication.GetPreviousInformationAsync(
+            order.WorkflowId, _sessionContext.RequiredUserId, _sessionContext.RequiredOrgId, _sessionContext.Roles, HttpContext.RequestAborted);
+
+        return new TargetStepInfo
+        {
+            CurrentBusinessType = currentStep.BusinessType,
+            TargetBusinessType = prevStep.BusinessType
+        };
+    }
+    
     #endregion
 
     #region 省工单退回

src/Hotline.Share/Dtos/Order/TargetStepInfo.cs

@@ -0,0 +1,9 @@
+using Hotline.Share.Enums.FlowEngine;
+
+namespace Hotline.Share.Dtos.Order;
+
+public class TargetStepInfo
+{
+    public EBusinessType CurrentBusinessType { get; set; }
+    public EBusinessType TargetBusinessType { get; set; }
+}