Adobe table data is hiding after adding digital signature..

Hi All,

I am adding digital signature dynamically using classes IF_FP_PDF_OBJECT and sending letter to SOST.

when i am opening letter from SOST attachment then table data is hiding. but when i put the mouse on table content then only that place value is getting visible. In attachment when i put mouse on table content then 60 value is getting visible.

Please find attachment.

Note: Before adding digital signature dynamically on letter  table content is visible.

Please assist me on this matter.

Need urgent help Image may be NSFW.
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Thanks,

Gursewak