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Working with PdfFileEditor: after concatenating pdf/a - 1b is invalid

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Hi,

I try to concatenate an array of pdfstreams with PdfFileEditor and afterwards converting the outputfile in PdfFormat.PDF_A_1B. Unfortunately the pdfformat is invalid with following errors:
Validating file "xyz.pdf" for conformance level pdfa-1b
xmp:CreateDate :: Wrong value type. Expected type 'Date'.
The XMP property 'xmp:CreateDate' is not synchronized with the document information entry 'CreationDate'.
The value of the key N is 4 but must be 3.
A device-specific color space (DeviceRGB) without an appropriate output intent is used.
The document does not conform to the requested standard.
The document doesn't conform to the PDF reference (missing required entries, wrong value types, etc.).
The document contains device-specific color spaces.
The document's meta data is either missing or inconsistent or corrupt.
Done.

If I work without PdfFileEditor, the pdfformat is valid. Could you please help me.

Best regards
Jessica

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