diff --git a/YLErpWeb/Controllers/margin_template_v2Controller.cs b/YLErpWeb/Controllers/margin_template_v2Controller.cs
index a0452fae..698c8b88 100644
--- a/YLErpWeb/Controllers/margin_template_v2Controller.cs
+++ b/YLErpWeb/Controllers/margin_template_v2Controller.cs
@@ -493,12 +493,16 @@ namespace YLErp.Web.Controllers
 
                 //BUG-14：明细生效日期回写——前端新增行只带占位日期（2020-01-01 前后），此前不回写使新行（含模板拷贝）
                 //落库 0001-01-01，被取数侧 Max(ValueDate) 分组静默丢弃；占位日期对齐本次提交行的最新生效日期，无有效行时用模板生效日期
+                //明细生效日期跟主表走：主表有真实生效日期时全部行强制对齐（含复制带入的源模板行日期、行上残留的旧日期），
+                //否则只改主表日期会出现"模板已生效但明细未生效"的取数断档；主表仍为占位日期时保持原兜底
                 var placeholderDate = new DateTime(2020, 1, 1);
-                var effectiveValueDate = marginTemplate.Details
-                    .Where(d => d.ValueDate > placeholderDate)
-                    .Select(d => d.ValueDate)
-                    .DefaultIfEmpty(marginTemplate.ValueDate > placeholderDate ? marginTemplate.ValueDate : placeholderDate)
-                    .Max();
+                var detailValueDate = marginTemplate.ValueDate > placeholderDate
+                    ? marginTemplate.ValueDate
+                    : marginTemplate.Details
+                        .Where(d => d.ValueDate > placeholderDate)
+                        .Select(d => d.ValueDate)
+                        .DefaultIfEmpty(placeholderDate)
+                        .Max();
 
                 marginTemplate.Details.ForEach(x =>
                 {
@@ -509,7 +513,7 @@ namespace YLErp.Web.Controllers
                         detail = new margin_template_detail();
                         yldb.margin_template_detail.Add(detail);
                     }
-                    detail.ValueDate = x.ValueDate > placeholderDate ? x.ValueDate : effectiveValueDate;
+                    detail.ValueDate = detailValueDate;
                     detail.MarginTemplateId = marginTemplate.id;
                     detail.GroupRatio = x.GroupRatio;
                     detail.MarginRatio1 = x.MarginRatio1;