difference between LC Reader extensions and Acrobat's Extend Features

[Former Community Member]

Hello,

is there any difference between the way, how works LC's Reader Extensions service and Acrobat's Extend Features?

We have a pdf form, which we can extend (enable features like saveing filled pdf form) by Acrobat, but extending by LC ES2 service trhrows exception:

ALC-RES-001-019: The input document is not a valid document type for  this operation.
com.adobe.internal.pdftoolkit.core.exceptions.PDFCosParseException:  Expected 'xref' : 437523

....

The document was not build by LC Designer nor Acrobat.

Thanks.