Assignment Time Information Upload for Individual Employee with different Date through OTLR WebAdi.

I have been trying to upload the Assignment time information for an individual employee

For Example:-

If I want to assign one rotation plan on a single Effective Start Date and Same Effective End Date and in next line I want to add a second entry with different Roaster and different Start and End Date for the same employee. It gives an error.

"Additional information already exist for this assignment."

Even though the 1st entry Effective End Date is same as the Effective Start Date. Like 1st April to 5th April is a different Roaster and 6th April to 10th April is a different Roaster.