How do I read multiple lines in RFC_READ_TEXT with one request?

Hello,

I am going through some problems, I need to access a large number of texts relating to the Purchase Order.

With the help of this topic(Retrieve texts from a sales order by using RFC_READ_TEXT), could use function RFC_READ_TEXT to access one of the purchase orders I needed.

But I need to access more than 22,000 requests per month. And according to the thread I mentioned I can only return one text at a time.

How could I do to extract a set of Purchase Order text with one request using RFC_READ_TEXT?

I really appreciate everyone's attention.

Thanks