Adobe Reader cannot save..just print the form

Hi friends

If this is the wrong post place...sorry.

Hope you can help me.

I made a simple form using LiveCycle Designer ES2. When finished I saved normally as PDF.

When sending via e-mail or copying to another computer...I´m opening the PDF in Adobe Reader to test if it works. All the fields are ok (I used simple fields, no JavaScript).

But Adobe Reader shows a message that the current form cannot be saved. If I want I could print to have a filled copy of the form.

What I´m missing?

How could I make the PDF opened by Adobe Reader and be able to save without problem?

Thank you a lot

Gustavo.