Same excise invoice series for all factories - Whether permitted?

[Yatin Bhopi]

We have four manufacturing unit having different excise registration (A, B, C, D). We have conman (SAP) system for accounting of all four units. My query is: we wish to use one serial no to issue excisable invoice for all locations. For eg . 1400001 – 1450000. It may happened that No.  1400001 will allocate to unit A automatically, 1400002 will be allocate to unit C 1400003 will be allocate to B etc.

Is this in line with law?

AI Summary

Excise invoice serialisation: invoices must be serially numbered per registration and intimated to range office.
Using a single pooled invoice series across multiple excise-registered factories raises compliance risk because invoices must be serially numbered and linked to the respective unit's registration; the serialisation scheme should be intimated to the Range Office. Advice given is to customise accounting software to generate unit-specific serial sequences to ensure independent, reconcilable numbering for monthly returns.