In the documentation of Lotus Notes 6.5.4 the description for entering a number as the second parameter for atLeftBack is as follows:
Number. Counting from right to left, the number of characters to skip. All the characters to the left of that number of characters are returned. If the number is negative, the entire string is returned.
However when used in Notes and given a negative number with @LeftBack, nothing is returned...
So which is the proper functionality?