Enhance getCumulativeTaxPercentWithExemptions function in FalukantService to first retrieve the character associated with the userId, ensuring accurate filtering of political offices by characterId for regional tax calculations.

backend/services/falukantService.js

@@ -147,16 +147,19 @@ async function calcRegionalSellPrice(product, knowledgeFactor, regionId, worthPe
     async function getCumulativeTaxPercentWithExemptions(userId, regionId) {
         if (!regionId) return 0;
         // fetch user's political offices (active) and their region types
-        // PoliticalOffice hat keine userId Spalte, daher müssen wir über FalukantCharacter filtern
+        // PoliticalOffice hat keine userId Spalte, daher müssen wir zuerst den Character finden
+        const character = await FalukantCharacter.findOne({
+            where: { userId },
+            attributes: ['id']
+        });
+        if (!character) {
+            // Wenn kein Character existiert, gibt es keine politischen Ämter
+            return 0;
+        }
+        
         const offices = await PoliticalOffice.findAll({
+            where: { characterId: character.id },
             include: [
-                {
-                    model: FalukantCharacter,
-                    as: 'holder',
-                    where: { userId },
-                    required: true,
-                    attributes: []
-                },
                 {
                     model: PoliticalOfficeType,
                     as: 'type',