HSDL multiple assignment rows update

Summary:

We have to perform HSDL load multiple assignment rows for an employee starting from Hire to 2 assignment changes and then global transfer and then 4 more assignment updates (out of which 2 updates are on same date).

We are getting multiple errors when we are trying to accommodate all in one template.

The load happens successfully if we try to do it one by one within HSDL.

Is this a limitation that we can't do multiple assignment updates in a single template?

We also tried keep Hire template as separate and then another template for Workrelationship/Assignment together to do global transfer & assignment changes.