17 May 2017 1:54 PM Recently a client noticed variances between the Bill of Materials on the Production orders (Production BOMs) and the Bill of Materials on the Items (Item BOMs). As far as anyone knew no manual changes were being made to the either BOM, which seemed plausible. After further investigating, it was clear that upon creation of the Production order the two BOMs were identical, however, after posting the Estimate the discrepancies were evident. There are a few standard Dynamics 365 for Operations (D365) scenarios that can cause differences between the two BOMs, such as consuming raw materials that do not exist on the Production BOM. However, for this blog, the focus will be on Phantom BOM lines and their impact on Production estimation, which was the cause in this particular case. What are BOM Line Types? The BOM line type is defined on the individual BOM line. This field tells D365 how to handle the line when estimating a Production order. There are four different options available: Item, Pegged Supply, Vendor, and Phantom. See the full post here!