Isapartof table not pulling order no. Automatically

Hi I created a table with a ref table and also marked isapartof in the source table, yet I am not able to auto fill the Lot No. from the existing row, I was able to do this for another table similar to this, yet I am facing issue here, not able to figure out the reason.

Even though the number is being automatically pulled n showing in the form as in photo below, the same is not reflecting in the Google sheet and hence when I go back to view the data, it shows blank, as the lot no. is blank in the Google sheet

“Auto fill” is typically done with an Initial value expression. Do you have one?

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How can I edit the number of columns or what columns appear In inline form like this which is ref. and isapartof like the one in photo Atta he’d with header Rice Packing details