How to get items on the BOM before save

Hi, the use case is as follows: A user adds items to a BOM, some of which have a (custom made) state of Obsolete I would like to get all the items on the BOM before the Part is saved, filter out the Obsolete and present their item_number in an error message to the user to instruct him to replace those. How do I go about that? I have tried a bit of XPath, of which I am a complete novice, but only managed to get back the items already saved on the BOM. The following is of course flawed, since the only items i can get from the this object are the ones already saved Any suggestions welcome :) [code] item = this; var relitemsList = item.getItemsByXPath("Relationships/Item[@type='Part BOM']"); var relCount = relitemsList.getItemCount(); for (int i = 0; i < relCount; i++) { var relItem = relitemsList.getItemByIndex(i); var bomItem = relItem.getRelatedItem(); var relatedState = bomItem.getProperty("eht_production_lc_state"); var relatedNumber = bomItem.getProperty("item_number"); if (relatedState == "Obsolete") { affectedParts += relatedNumber + "\r\n"; } } if (string.IsNullOrEmpty(affectedParts)) return item; var errorMsg = "Cannot save item because the following items on the BOM are obsolete:\r\n" + affectedParts; return inn.newError(errorMsg); [/code]
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