diff --git a/frontend/src/lib/components/Forms/ModelForm/EbiosRmForm.svelte b/frontend/src/lib/components/Forms/ModelForm/EbiosRmForm.svelte
index 30a784ad0..20ba8c544 100644
--- a/frontend/src/lib/components/Forms/ModelForm/EbiosRmForm.svelte
+++ b/frontend/src/lib/components/Forms/ModelForm/EbiosRmForm.svelte
@@ -26,7 +26,6 @@
 	/>
 	<TextField
 		{form}
-		required
 		field="ref_id"
 		label={m.refId()}
 		cacheLock={cacheLocks['ref_id']}
diff --git a/frontend/src/lib/utils/crud.ts b/frontend/src/lib/utils/crud.ts
index 3270c8392..53fc12a4c 100644
--- a/frontend/src/lib/utils/crud.ts
+++ b/frontend/src/lib/utils/crud.ts
@@ -584,7 +584,6 @@ export const URL_MODEL_MAP: ModelMap = {
 		verboseName: 'Ebios RMstudy',
 		verboseNamePlural: 'Ebios RMstudy',
 		foreignKeyFields: [
-			{ field: 'risk_matrix', urlModel: 'risk-matrices' },
 			{ field: 'risk_matrix', urlModel: 'risk-matrices' },
 			{ field: 'assets', urlModel: 'assets' },
 			{ field: 'authors', urlModel: 'users', urlParams: 'is_third_party=false' },