WD4A service call storing multi-line text-edit fields

Dear Form Members

Please can you help with my problem

I have a webdynpro abap form for registering feedback with 3 different text-edit fields on it. The user can type many words in these fields that can go over many lines.

I use a service call to call a remote function to save the data in the backend, but I cannot work out how to store the 3 text fields with many lines into the backend.

I tried using the STRING importing parameter for each field but the remote function does not allow this type.

Please can you help with as much detail as possible as this is my first attempt at this.

Many Thanks