only accept ppm or dalton for MassChroqML

src/gui/export/export_masschroq_dialog/exportmasschroqdialog.cpp

@@ -171,6 +171,19 @@ ExportMasschroqDialog::accept()
         }
     }
 
+  if((ui->xicRangeWidget->getPrecision()->unit() ==
+      pappso::PrecisionUnit::ppm) ||
+     (ui->xicRangeWidget->getPrecision()->unit() ==
+      pappso::PrecisionUnit::dalton))
+    { // ok
+    }
+  else
+    {
+      error_message =
+        QString(tr("MassChroQ can only work with ppm or dalton units. Please "
+                   "change the XIC extraction precision unit."));
+    }
+
   if(error_message.isEmpty())
     {
       ZivyParams zivy_params = ui->zivyParamWidget->getZivyParams();