If you set the Schedule Link to Create Link, this line is used in the transfer to an ESP.
No Link
If the Integration External Scheduling package parameter and
the Cost Type parameter in the PSS Parameters (tppss0100s000) session are cleared, the Schedule Link field is set to No Link.
Linked
If the Schedule Link field is set to Linked, an ESP has copied the line to that package.
Note
If the Used in Schedule check box on the standard cost
object session is cleared, you cannot link the budget line.