2013 SECTION VIII - DIVISION 1中关于针孔和显示中的图像黑度变化是不是矛盾了？

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1.4-3 ACCEPTANCE CRITERIA
(a) Image Density. Density within the image of the indication may vary and is not a criterion for acceptance or rejection.
2.UW-38 REPAIR OF WELD DEFECTS
       Defects, such as cracks, pinholes, and incomplete fusion,detected visually or by the hydrostatic or pneumatic test or by the examinations prescribed in UW-11 shall be removed by mechanical means or by thermal gouging processes, after which the joint shall be rewelded
          ASME中一面说：显示中的图像黑度变化，不作为验收和拒收的标准，另一方面又规定针孔必须返修，针孔就是以显示中的图像黑度变化定义的。这是不是有问题？写后面忘记了前面？还是有什么其他的道理？