BOM is not edit

Dear All

pls look into this issue

ERROR:

BOM for article 300319027 in site 1613 could not be exploded

Message no. M7535

we have BOM with is used by user without maintaing components. now we r trying to edit that material but is not allowing. pls do the need ful ASAP.

(note; user not agring for delete the same & for createing new one)

Regards

Sudha