diff --git a/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.component.jsx b/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.component.jsx
index 4fed7188b..fdf5207db 100644
--- a/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.component.jsx
+++ b/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.component.jsx
@@ -289,7 +289,7 @@ export function JobLinesUpsertModalComponent({
             name="prt_dsmk_p"
             initialValue={0}
           >
-            <InputNumber precision={0} min={0} max={100} />
+            <InputNumber precision={0} min={-100} max={100} />
           </Form.Item>
           <Form.Item
             label={t("joblines.fields.tax_part")}
diff --git a/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.container.jsx b/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.container.jsx
index b3a28aeb5..006459959 100644
--- a/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.container.jsx
+++ b/client/src/components/job-lines-upsert-modal/job-lines-upsert-modal.container.jsx
@@ -13,6 +13,7 @@ import { selectJobLineEditModal } from "../../redux/modals/modals.selectors";
 import UndefinedToNull from "../../utils/undefinedtonull";
 import JobLinesUpdsertModal from "./job-lines-upsert-modal.component";
 import Axios from "axios";
+import Dinero from "dinero.js";
 const mapStateToProps = createStructuredSelector({
   jobLineEditModal: selectJobLineEditModal,
 });
@@ -40,7 +41,15 @@ function JobLinesUpsertModalContainer({
               manual_line: !(
                 jobLineEditModal.context && jobLineEditModal.context.id
               ),
-              ...UndefinedToNull(values),
+              ...UndefinedToNull({
+                ...values,
+                prt_dsmk_m: Dinero({
+                  amount: Math.round(values.act_price * 100),
+                })
+                  .percentage(Math.abs(values.prt_dsmk_p || 0))
+                  .multiply(values.prt_dsmk_p >= 0 ? 1 : -1)
+                  .toFormat(0.0),
+              }),
             },
           ],
         },
@@ -68,7 +77,15 @@ function JobLinesUpsertModalContainer({
       const r = await updateJobLine({
         variables: {
           lineId: jobLineEditModal.context.id,
-          line: values,
+          line: {
+            ...values,
+            prt_dsmk_m: Dinero({
+              amount: Math.round(values.act_price * 100),
+            })
+              .percentage(Math.abs(values.prt_dsmk_p || 0))
+              .multiply(values.prt_dsmk_p >= 0 ? 1 : -1)
+              .toFormat(0.0),
+          },
         },
         refetchQueries: ["GET_LINE_TICKET_BY_PK"],
       });