Linking tasks between projects error

[clear2pay]

Hi,
I am trying to link a task between 2 projects but get thie error:



"There is a problem with the entry. The accrual choice is not valid. Type Start, Prorated, or End"

I created the initial project schedule and then 'saved as' to another name. e.g. pr1 saved as pr2.

In pr2 I am trying to link to a task in pr1 by typing in the full address in the Predecessor space. e.g.
C:\MyProject\Project Schedule\pr1.mpp\114