FIX force rounding mode 0 for expense report (#30191)

htdocs/core/class/commonobject.class.php

@@ -3855,6 +3855,12 @@ abstract class CommonObject
 			$fieldup = 'pu_ht';
 		}
 		if ($this->element == 'expensereport') {
+			// force rounding mode to 1
+			// otherwise when you set MAIN_ROUNDOFTOTAL_NOT_TOTALOFROUND to 1
+			// you have 2 lines with same TTC amounts (6,2 Unit price TTC and VAT rate 20%)
+			// on the first line you got 5,17 on HT total
+			// when you got 5,16 on HT total and 1,04 on VAT total to get 6,20 on TTT total (see #30051)
+			$forcedroundingmode = '0';
 			$fieldup = 'value_unit';
 			$base_price_type = 'TTC';
 		}