Billing block on Sales order

Hi Gurus,

I have a question. We can apply Billing blocks on Header and Item level in a sales order 'OR' document.

Security blocked an User from removing Billing block on a Sales order for both Header and item level.

She gets 'Authorization block' when she double click on item --> Billing documents--> and remove billing block (Field VBAP-FAKSP)

But, Issue is, on the Sales overview screen of the sales order, she scrolls towards the right of the item and removes Billing block on Item. This time she's able to save the document and NO authorization block message.

I checked , both are same field, as it should be, VBAP-VAKSP.

Can you please advise?

Thanks

Nidhish