PADS2007导出ASC 出错？

朋友发给我一个PADS2007做的带多个BGA的PCB文件，帮他转成低版本的ASC，在导出ASC文件时
出现如下提示：
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Database conversion Report on file Layout.pcb -- Tue Feb 28 15:57:51 2012
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"Tag" piece on layer Top near (18922.59, 16509.87) (Drawing name: DDR3_8BIT, Id: 16)
is not supported in the format you selected for export: unsupported object type.
Piece skipped.
"Tag" piece on layernear (18922.59, 16509.87) (Drawing name: DDR3_8BIT, Id: 16)
is not supported in the format you selected for export: unsupported object type.
Piece skipped.
接着就结束，没转成功，望各位大侠指点指点，谢谢！

先自已顶一下，望遇到这种情况的大侠发表一下高见！