Dynamic Table or Ref type in RFC parameters

Hello All,

I am searching for possibilities for creating table with dynamic field size in RFC.

But as it gives following message when I use Ref as table field.

"No reference types are allowed for RFC" .

I have requirement to get output fields values of only those which are in mentioned in input.

As of in standard RFC "RFC_READ_TABLE" is controlling output fields by FIELDS table

But what I am looking for is if I am giving 2 field in input then output table's size should be of total size of 2 fields in input.

Means the size is all depends on input fields.

The other way, I think, is a table field of string type.

So at time of actually value is assigned to that field the size would be decided .

Appreciate any help.

Regards.