к сожалению, это так..
Microsoft Axapta Developer's Guide \ Operators and Expressions \ Operator precedence
Цитата:
logical operators (AND, OR)
&& and ||
In X++, && (logical AND) and || (logical OR) have the same precedence and are evaluated from left to right.
This means that
0&&0||1 == 1 while
1||0&&0 == 0