[PDFNet] PDF/A conversion: How do I resolve e_PDFA2_3_3_1, Device-specific color space used, but no GTS_PDFA1 OutputInten?

Q: We are editing a PDF document : Copy elements, Insert images,
Change text, and Add new pages.

After updates, we save the document like this :
            string newPdfFile = NewPdfFileName(workingFolder);
            pdfDoc.Save(newPdfFile, 0);
            pdfDoc.Close();

                When we want to save our document in PDF/A 1b, we get
the following error : e_PDFA2_3_3_1, Device-specific color space used,
but no GTS_PDFA1 OutputIntent
                          pdf_a = new PDFACompliance(true, nomFichier,
null, this._pdfnetNorme, null, 10, false);
                pdf_a.SaveAs(outputFichier, this.Linearized);

                if (verifyConversion)
                {
                    pdf_a = new PDFACompliance(false, outputFichier,
null, this._pdfnetNorme, null, 10, false);
                     . . .
                }

      We have no error if we save in PDF/A 1b after each updates;

      We initialize your component like this :
   pdftron.PDFNet.Initialize();
   pdftron.PDFNet.SetColorManagement(pdftron.PDFNet.CMSType.e_no_cms);

Question is :
      Is it possible to save our updates in PDF and latter in PDFA/1b
without this “device-specific color space” ?
---------------
A: I am not sure if I understand the issue correctly, but it
seems that you didn’t enable color management
(pdftron.PDFNet.SetColorManagement(pdftron.PDFNet.CMSType.e_little_cms/
e_icm2) which is important for tests related to color management in
PDFACompliance class.

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