| Engineer-to-order fit | Possible with careful configuration, project manufacturing modules, and disciplined master data. | ERP controls transactions; the second layer controls evolving scope and handoffs. | Flexible, but relationships and release rules depend on people. | Strong when its native workflow matches the cab shop. |
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| Implementation effort | Usually the broadest process, data, training, and migration effort. | Requires clear ownership and defined boundaries between systems. | Low initial setup; continuing maintenance and reconciliation remain manual. | Narrower than full ERP, but operating practices still need agreement. |
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| Drawing and revision control | Varies; often needs product lifecycle management, document control, or customization. | Handled in the coordination layer, with release status passed to ERP. | Folders and naming conventions are easy to bypass. | Can model submittals, revisions, change orders, and release directly. |
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| Accounting depth | Strongest option for ledgers, valuation, close, controls, and consolidation. | Accounting remains in ERP, where it belongs. | Requires separate accounting software and duplicate entry. | Usually shallower; verify whether accounting is included at all. |
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| Who it suits | Larger or repeat-production operations needing financial and plant control. | Cab shops that need ERP control without forcing unfinished scope into it. | Small teams with low volume and tolerance for manual control. | Teams whose main gap is an industry-specific job workflow. |
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