fix: Graph fetch relations with sales & purchases models.

feat: Inventory tracker algorithm lots with FIFO or LIFO cost method.

server/src/models/Bill.js

@@ -44,9 +44,6 @@ export default class Bill extends mixin(TenantModel, [CachableModel]) {
     const ItemEntry = require('@/models/ItemEntry');
 
     return {
-      /**
-       *
-       */
       vendor: {
         relation: Model.BelongsToOneRelation,
         modelClass: this.relationBindKnex(Vendor.default),
@@ -56,9 +53,6 @@ export default class Bill extends mixin(TenantModel, [CachableModel]) {
         },
       },
 
-      /**
-       * 
-       */
       entries: {
         relation: Model.HasManyRelation,
         modelClass: this.relationBindKnex(ItemEntry.default),
@@ -66,6 +60,9 @@ export default class Bill extends mixin(TenantModel, [CachableModel]) {
           from: 'bills.id',
           to: 'items_entries.referenceId',
         },
+        filter(builder) {
+          builder.where('reference_type', 'SaleReceipt');
+        },
       },
     };
   }