Problem Adding Bend Table To Existing Part

I get this error when I try to add an Excel K Factor table to an existing part (created with the sheetmetal feature) and then flatten it

"Bend Table Has Invalid Format"

"This part contains features that cannot be unbent"

If I recreate the part with the same dimensions and use the K Factor table from the very beginning then the part works fine

Thank you

SolidworksSheet Metal