diff --git a/src/main/java/com/ffii/tsms/modules/report/service/ReportService.kt b/src/main/java/com/ffii/tsms/modules/report/service/ReportService.kt
index 5761c88..9f01d30 100644
--- a/src/main/java/com/ffii/tsms/modules/report/service/ReportService.kt
+++ b/src/main/java/com/ffii/tsms/modules/report/service/ReportService.kt
@@ -250,7 +250,7 @@ open class ReportService(
 
             val uninvoiceCell = row.createCell(11)
             uninvoiceCell.apply {
-                cellFormula = " IF(H15<=I15, H15-K15, IF(AND(H15>I15, I15<K15), 0, IF(AND(H15>I15, I15>=K15), I15-K15, 0))) "
+                cellFormula = " IF(H${rowNum}<=I${rowNum}, H${rowNum}-K${rowNum}, IF(AND(H${rowNum}>I${rowNum}, I${rowNum}<K${rowNum}), 0, IF(AND(H${rowNum}>I${rowNum}, I${rowNum}>=K${rowNum}), I${rowNum}-K${rowNum}, 0))) "
                 cellStyle = boldFontCellStyle
                 cellStyle.dataFormat = accountingStyle
             }