Bugfix/handling of zero buying power in static portfolio analysis rules (#5474)

* Improve handling of 0 buying power

* Update changelog

CHANGELOG.md

@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- Improved the handling of `0` buying power in the static portfolio analysis rule: _Liquidity_ (Buying Power)
 - Fixed an issue related to the error handling in the data provider status component
 
 ## 2.196.0 - 2025-09-04

apps/api/src/models/rules/asset-class-cluster-risk/equity.ts

@@ -67,6 +67,7 @@ export class AssetClassClusterRiskEquity extends Rule<Settings> {
         value: false
       };
     }
+
     return {
       evaluation: this.i18nService.getTranslation({
         id: 'rule.assetClassClusterRiskEquity.true',

apps/api/src/models/rules/asset-class-cluster-risk/fixed-income.ts

@@ -67,6 +67,7 @@ export class AssetClassClusterRiskFixedIncome extends Rule<Settings> {
         value: false
       };
     }
+
     return {
       evaluation: this.i18nService.getTranslation({
         id: 'rule.assetClassClusterRiskFixedIncome.true',

apps/api/src/models/rules/liquidity/buying-power.ts

@@ -22,10 +22,21 @@ export class BuyingPower extends Rule<Settings> {
   }
 
   public evaluate(ruleSettings: Settings) {
-    if (this.buyingPower < ruleSettings.thresholdMin) {
+    if (this.buyingPower === 0) {
       return {
         evaluation: this.i18nService.getTranslation({
-          id: 'rule.liquidityBuyingPower.false',
+          id: 'rule.liquidityBuyingPower.false.zero',
+          languageCode: this.getLanguageCode(),
+          placeholders: {
+            baseCurrency: ruleSettings.baseCurrency
+          }
+        }),
+        value: false
+      };
+    } else if (this.buyingPower < ruleSettings.thresholdMin) {
+      return {
+        evaluation: this.i18nService.getTranslation({
+          id: 'rule.liquidityBuyingPower.false.min',
           languageCode: this.getLanguageCode(),
           placeholders: {
             baseCurrency: ruleSettings.baseCurrency,

apps/client/src/app/pages/i18n/i18n-page.html

@@ -69,10 +69,13 @@
       </li>
       <li i18n="@@rule.liquidity.category">Liquidity</li>
       <li i18n="@@rule.liquidityBuyingPower">Buying Power</li>
-      <li i18n="@@rule.liquidityBuyingPower.false">
+      <li i18n="@@rule.liquidityBuyingPower.false.min">
         Your buying power is below $&#123;thresholdMin&#125;
         $&#123;baseCurrency&#125;
       </li>
+      <li i18n="@@rule.liquidityBuyingPower.false.zero">
+        Your buying power is 0 $&#123;baseCurrency&#125;
+      </li>
       <li i18n="@@rule.liquidityBuyingPower.true">
         Your buying power exceeds $&#123;thresholdMin&#125;
         $&#123;baseCurrency&#125;