>>>I guessed it would work but have not been able to make it happen. I'll try harder.
>>
>>One more thing: the recordsource for the grid should be the alias which is related to the other, i.e. the one on which you issued Set Relation To.
>
>To make it clear, if Invoices and InvoiceItems are related, the grid recordsource should be Invoices, right?

That's what I meant, yes. Any luck?