diff --git a/src/core/parser.js b/src/core/parser.js
index 18bf151..0b91422 100644
--- a/src/core/parser.js
+++ b/src/core/parser.js
@@ -164,6 +164,15 @@ export function parse(input, variables = []) {
 					operator: newOperator,
 					left: { type: "field", value: right }
 				};
+			} else {
+				// Regular comparison where left is a parenthesized expression or function result
+				const right = parseValue(operator);
+				left = {
+					type: "comparison",
+					left: left,
+					operator: operator,
+					value: right
+				};
 			}
 		}
 
diff --git a/tests/parser.test.js b/tests/parser.test.js
index 0a6e144..4cd0adf 100644
--- a/tests/parser.test.js
+++ b/tests/parser.test.js
@@ -407,8 +407,40 @@ describe("Parser SQL to dx Filter Builder", () => {
             expected: [
                 "AccountID", "=", 42
             ]
+        },
+        {
             input: "ID IN ({SampleDoc.AuthFilterID})",
             expected: []
+        },
+        {
+            input: "ItemGroupType IN ({ItemPrice.AllowedItemGroupType}) AND ((ISNULL(IsNonStock,0))={ItemPrice.AllowedNonStock})  AND (CompanyID = {ItemPrice.CompanyID} OR {ItemPrice.CompanyID} = 0 OR ISNULL(CompanyID,0) = 0)",
+            expected: [
+                [
+                    [
+                        ["ItemGroupType", "=", "1"],
+                        "or",
+                        ["ItemGroupType", "=", "2"]
+                    ],
+                    "and",
+                    [
+                        ["IsNonStock", "=", 1, { "defaultValue": 0, "position": "column", "type": "ISNULL" }, 1],
+                        "or",
+                        ["IsNonStock", "=", true]
+                    ]
+                ],
+                "and",
+                [
+                    ["CompanyID", "=", 7],
+                    "or",
+                    [
+                        ["CompanyID", "=", 0],
+                        "or",
+                        ["CompanyID", "=", null, { "defaultValue": 0, "position": "column", "type": "ISNULL" }, null],
+                        "or",
+                        ["CompanyID", "=", false]
+                    ]
+                ]
+            ]
         }
     ];
 
@@ -479,6 +511,9 @@ const sampleData = {
     "SaleOrderStatusStmtGlobalRpt.RegionID": null,
     "WorkOrderLine.CompanyIDs": ["0,1"],
     "PurchaseOrderDocument.IsMultiBrand": false,
-    "PurchaseOrderDocument.AllowedApplicableMake": "0"
-    "SampleDoc.AuthFilterID": "ID"
+    "PurchaseOrderDocument.AllowedApplicableMake": "0",
+    "SampleDoc.AuthFilterID": "ID",
+        "ItemPrice.AllowedItemGroupType": "1,2",
+    "ItemPrice.AllowedNonStock": 1,
+    "ItemPrice.CompanyID": 7
 };
\ No newline at end of file