求助：关于逻辑图生成pcb的问题

逻辑图第一次进行ECO TO PCB 没有任何错误和警号，但是我什么都不改再点一次ECO TO PCB就会出现很多警告：
Line 15 , Section *DEL_ATTRIBUTE*
"Comment"
* WARNING: Processing command to delete attribute "Comment" from Component J2.
*          The attribute is also inherited from Decal AUD_JACK_6PIN.
*          The change is not fully reconciled for cases where the schematic
*          does not support hierarchical attributes.
Line 17 , Section *DEL_ATTRIBUTE*
"Comment"
* WARNING: Processing command to delete attribute "Comment" from Component BT1.
*          The attribute is also inherited from Decal HB414--II06E(RTC).
*          The change is not fully reconciled for cases where the schematic
*          does not support hierarchical attributes.
Line 19 , Section *DEL_ATTRIBUTE*
"Comment"
* WARNING: Processing command to delete attribute "Comment" from Component J5.
*          The attribute is also inherited from Decal BAT_HEADER1.
*          The change is not fully reconciled for cases where the schematic
*          does not support hierarchical attributes.

警告有700多个，但都是像上面一样的，想请教是什么原因