further development of the predefinedmutations

app/Models/Ledger.php

@@ -31,6 +31,11 @@ class Ledger extends Model
         return $this->hasMany(Mutation::class);
     }
 
+    public function predefinedMutations(): HasMany
+    {
+        return $this->hasMany(PredefinedMutation::class);
+    }
+
     public function media(): \Illuminate\Database\Eloquent\Relations\MorphMany
     {
         return $this->morphMany(Media::class, 'mediable');