This button is enabled for capital budgets only. Once clicked,
a new screen is opened that displays the entity key (disabled)
and allows the selection of other capital budget entities existing
for the same baseline for cross referencing purposes. These are
populated from the budget payment delivery table. These entities
can then be moved across and once Apply has been clicked, the
entity in question is cross referenced to other capital entities
and schedule lines.
A schedule may not be used more than once in a cross reference.
For example, if schedule 'a' has 2 cross references, schedules 'b'
and 'c', schedule 'b' may not have 'a' as a cross reference.