fix:发票管理合同校验

src/views/business/invoice/form.vue

@@ -82,7 +82,7 @@
                     <el-row :gutter="30">
                         <el-col :span="6">
                             <el-form-item label="合同编号：" required>
-                                <el-input tabindex="-1" v-if="editStatus" style="width: 100%" v-model.trim="form.contractNo"
+                                <el-input tabindex="-1" v-if="editStatus" readonly style="width: 100%" v-model.trim="form.contractNo"
                                     size="small" type="text" @click="() =>contractChoiceHandler(this)" placeholder="请选择" :clearable="true">
                                     <template #append>
                                         <el-button icon="Search" @click="() => contractChoiceHandler(this)" />
@@ -652,7 +652,6 @@
         });
     }
     function contractChoiceHandler(input) {
-        form.value.contractNo = null;
         proxy.$refs.contractChoiceRef.open();
     }
     function contractChoiceHandle(info) {