--- id: post/duiliotacconi-com/1457 type: post title: "Dynamics 365 Business Central 2025 Wave 1 (26.x): real values to upgrade" summary: Dynamics 365 Business Central 26.x introduces a less-locking inventory posting engine and optimizes FlowField calculations on pages. A production environment with 2,000+ background sessions per hour saw nearly all Item Ledger Entry deadlocks disappear after upgrading and enabling these features, though subsequent third-party application deadlocks required targeted optimization. tier: community language: en tags: - performance optimization - inventory posting - deadlock reduction - flowfield calculations - locking strategy - wave 1 26.x - concurrency - number sequence system: inventory review: state: reviewed by: opus at: "2026-10-08T02:00:27.323Z" flags: [] generated: at: "2026-10-08T01:26:53.141Z" pipeline: 0.2.0 prompts: extract-post: 1 input_hash: c393be7469316bcf85469706a3383e3e8341f0ca910d8d88668814ac39283195 evidence: - kind: blog url: https://duiliotacconi.com/2025/07/03/dynamics-365-business-central-2025-wave-1-26-x-real-values-to-upgrade/ title: "Dynamics 365 Business Central 2025 Wave 1 (26.x): real values to upgrade" date: "2025-07-03" commit: null t: null quote: null - kind: blog url: https://duiliotacconi.com/2025/07/03/dynamics-365-business-central-2025-wave-1-26-x-real-values-to-upgrade/ title: "Dynamics 365 Business Central 2025 Wave 1 (26.x): real values to upgrade" date: "2025-07-03" commit: null t: null quote: Item Ledger Entry deadlocks and lock timeouts… puff. Gone with the wind. - kind: blog url: https://duiliotacconi.com/2025/07/03/dynamics-365-business-central-2025-wave-1-26-x-real-values-to-upgrade/ title: "Dynamics 365 Business Central 2025 Wave 1 (26.x): real values to upgrade" date: "2025-07-03" commit: null t: null quote: The difference, sometimes, is HUGE. (overall when you have invisible FlowFields that does not have a supporting index) - kind: blog url: https://duiliotacconi.com/2025/07/03/dynamics-365-business-central-2025-wave-1-26-x-real-values-to-upgrade/ title: "Dynamics 365 Business Central 2025 Wave 1 (26.x): real values to upgrade" date: "2025-07-03" commit: null t: null quote: When you upgrade and enable the new inventory posting engine, you must test the concurrency A LOT. links: learn: [] objects: - object/table/32 - object/table/169 features: [] topics: [] localizations: [] videos: [] posts: [] guidelines: [] post_id: "1457" source_id: duiliotacconi-com source_name: Duilio Tacconi url: https://duiliotacconi.com/2025/07/03/dynamics-365-business-central-2025-wave-1-26-x-real-values-to-upgrade/ published_at: "2025-07-03T15:30:41.000Z" author: Duilio Tacconi full_text: false words: 1319 quotes: - text: Item Ledger Entry deadlocks and lock timeouts… puff. Gone with the wind. why_it_matters: Demonstrates the tangible impact of the new inventory posting engine on reducing contention in complex manufacturing environments - text: The difference, sometimes, is HUGE. (overall when you have invisible FlowFields that does not have a supporting index) why_it_matters: Shows why skipping FlowField calculations for hidden columns can dramatically improve page performance - text: When you upgrade and enable the new inventory posting engine, you must test the concurrency A LOT. why_it_matters: Emphasizes that the feature requires comprehensive testing to surface new deadlock patterns that may emerge code_objects_mentioned: - table Item Ledger Entry - table Job Ledger Entry - table Resource Ledger Entry - other Number Sequence systems: - inventory - manufacturing - platform versions_mentioned: - 26.x - "26.1" - 25.x preview: embeddable: true frame_url: https://duiliotacconi.com/2025/07/03/dynamics-365-business-central-2025-wave-1-26-x-real-values-to-upgrade/embed/ image: https://duiliotacconi.com/wp-content/uploads/2025/07/blogssss.jpg image_alt: null image_w: 736 image_h: 567 site_name: Dynamics 365 Business Central tales, myths, legends. And something serious. favicon: https://duiliotacconi.com/wp-content/uploads/2023/07/cropped-wordpress.png?w=32 probed_at: "2026-10-07T11:51:05.132Z" --- # Dynamics 365 Business Central 2025 Wave 1 (26.x): real values to upgrade [Read the post](https://duiliotacconi.com/2025/07/03/dynamics-365-business-central-2025-wave-1-26-x-real-values-to-upgrade/) · Duilio Tacconi (Duilio Tacconi, MVP) · 2025-07-03 · 1319 words · tier community · reviewed (checked by Opus) > Dynamics 365 Business Central 26.x introduces a less-locking inventory posting engine and optimizes FlowField calculations on pages. A production environment with 2,000+ background sessions per hour saw nearly all Item Ledger Entry deadlocks disappear after upgrading and enabling these features, though subsequent third-party application deadlocks required targeted optimization. ## Key points - The new 26.x inventory posting engine, built on Number Sequence, practically removed Item Ledger Entry deadlocks and lock timeouts in a busy online manufacturing environment - Changing the locking order exposed new deadlocks in in-house third-party apps, fixed with read isolation instead of locktable, SIFT tuning with a session-based bucket number, and Number Sequence instead of Autoincrement - Skipping FlowField calculation for hidden page columns cut page load times, sometimes dramatically when the hidden FlowField lacks an index - One visible standard column depended on a hidden FlowField and stopped calculating; making the hidden field visible via personalization fixed it - Test concurrency heavily with BCPT and check for visible fields depending on hidden FlowFields before enabling these features ## Quotes - "Item Ledger Entry deadlocks and lock timeouts… puff. Gone with the wind." (Demonstrates the tangible impact of the new inventory posting engine on reducing contention in complex manufacturing environments) - "The difference, sometimes, is HUGE. (overall when you have invisible FlowFields that does not have a supporting index)" (Shows why skipping FlowField calculations for hidden columns can dramatically improve page performance) - "When you upgrade and enable the new inventory posting engine, you must test the concurrency A LOT." (Emphasizes that the feature requires comprehensive testing to surface new deadlock patterns that may emerge) ## AL objects mentioned As named in the post. A name that matches one object page by exact type and name links to it; the others stay as named. - [table 32 "Item Ledger Entry"](../../objects/table/32.md) - [table 169 "Job Ledger Entry"](../../objects/table/169.md) - table "Resource Ledger Entry" - other "Number Sequence" Not found in BC28-30: table "Resource Ledger Entry". ## Context - Features: Less-locking inventory posting engine, Visible FlowField calculation optimization, Number Sequence object for inventory posting, SIFT optimization with bucket distribution, ReadIsolation isolation level - Versions: 26.x, 26.1, 25.x Source: Duilio Tacconi, community blog. Summary, key points and quotes are derived (CONTENT-NOTICE.md); read the original for the full text.