Error on Scheduled Refresh: Table contains blank values

Hi,

Has anyone solved this?

I'm facing almost the same issue. Error message is: Column '' in Table '' contains blank values and this is not allowed for columns on the one side of a many-to-one relationship or for columns that are used as the primary key of a table.

But this is happening today as yestearday no issue happened. The calculated column that gives this error is calculated like this:

GOAL = LOOKUPVALUE(Services[GOAL]; Services[Case_ID]; Orders[Case_ID]) 

An GOAL needs to have null values (because newest services aren't estimated yet) and these null values are checked later.