Text Box does not follow Acroform standards

[peter forgacs]

Hello

When creating a TextBox, the resulting Acroform dictionary is missing the Fields entry. According to the adobe pdf reference, at 8.6.1, Fields should be required. 

Example result:

13 0 obj
<</AcroForm <</DR <</Font <</ArialMT 21 0 R
>>
>>
>>
/Type /Catalog
/Outlines 27 0 R
/Metadata 29 0 R
/Pages 3 0 R
>>
endobj

Example of a correct acroform dictionary:
 

61 0 obj
<</Type/Catalog/Pages 24 0 R
/OpenAction[1 0 R /XYZ null null 0]
/ViewerPreferences<</DisplayDocTitle true
>>
/Lang(en-GB)
/AcroForm<</Fields[
5 0 R 7 0 R 8 0 R 9 0 R 10 0 R
11 0 R 12 0 R 13 0 R 14 0 R 16 0 R
17 0 R 18 0 R 19 0 R 20 0 R 21 0 R
22 0 R 23 0 R 
]/DR 37 0 R/NeedAppearances true>>
>>
endobj