2.1.1446 Part 1 Section 21.2.2.31, crossAx (Crossing Axis ID)
a. The standard states that the values of the val attribute are defined by the XML Schema unsignedInt datatype.
-
Office restricts the value of this attribute to be at most 2147483647.
b. The standard does not place any restrictions on the val attribute of the crossAx element.
-
Office requires that the val attribute of the crossAx element matches the val attribute of an axId element in the parent chart.