SelectHR will only allow the same pay element to be selected if the previous appointment has ended at the time of creating the new pay history record. There are two ways of working around this.
Set the end date of the current appointment to a previous date, create the pay history record on the new appointment, and then amend the end date of the current appointment to the actual end date.
Wait until the new appointment has started and then create the pay history record, as the previous appointment will have officially ended.
Example
An employee has two active appointments. A new basic pay record needs to be created within the newest appointment, but the pay element drop-down is blank.
For example, the first appointment has the Basic Pay element assigned to it. On the second appointment, the employee would also be assigned the Basic Pay element.
However, as only one pay element can be set per pay period, a new pay element equivalent to the one already in use in the older appointment must be created (i.e. Basic Pay1).
There is more information available about how to create a new pay element.