Step 01
Primary unit defined
Each item carries a primary unit (typically the unit of inventory tracking, e.g., piece, kilogram, litre).
Item Master Software | Units of Measure
Order in cartons. Invoice in pieces. Post in kilograms.
Primary, secondary and conversion factors per item. The PO uses one unit, the customer invoice another, the books a third. Conversion runs automatically. The audit trail captures the unit at every transaction.
How it works
Multiple units, one source of truth.
Step 02
Secondary units with conversion
Secondary units (carton, dozen, ton) configured with their conversion factor to the primary. Conversion can be fixed or variable (item-specific weight per piece).
Step 03
Per-document unit
PO can be in cartons, GRN converts to pieces at receipt, customer invoice issues in pieces, the books post in primary units. Each document shows the unit it was raised in.
Step 04
Audit trail captures the conversion
Every conversion is captured with the source and target units, the factor and the timestamp. Variance (e.g., a carton with 24 pieces vs the expected 25) flags for resolution.
What the system does
Capability, input, output.
| Capability | Input | Output |
|---|---|---|
| Primary + secondary + conversion | Per-item unit configuration | Multi-unit support with conversion |
| Variable conversion | Item-specific weight per piece | Per-batch conversion factor |
| Per-document unit | PO / GRN / invoice / posting | Document in its native unit; books in primary |
| Conversion audit trail | Every conversion event | Source-target-factor per event |
-
Primary + secondary + conversion
- Input
- Per-item unit configuration
- Output
- Multi-unit support with conversion
-
Variable conversion
- Input
- Item-specific weight per piece
- Output
- Per-batch conversion factor
-
Per-document unit
- Input
- PO / GRN / invoice / posting
- Output
- Document in its native unit; books in primary
-
Conversion audit trail
- Input
- Every conversion event
- Output
- Source-target-factor per event
Compliance + integrations
GST invoice in the unit the buyer ordered.
Section 31 + Rule 46 require the unit on the GST invoice. The system supports per-document unit with the conversion documented. The HSN summary uses the primary unit consistently.
Regulations we work within
-
Rule 46, CGST Rules
Unit (UQC) on the GST invoice per the GSTN UQC list.
-
Rule 11(g), Companies Act
Conversion captured in the audit trail.
Connects to
- GSTN UQC list Unique Quantity Codes for invoices
Units of Measure FAQ
What buyers ask.
Variable conversion (e.g., a kg of fish has variable piece counts) how is it handled?
Variable conversion is supported per batch. Each receipt captures the actual conversion factor (e.g., this batch has 4.2 pieces per kg). Issues use the batch-specific factor. The audit trail captures the factor per batch.
GSTN UQC list. Are all our units mapped?
Yes. The system maps your internal units to the GSTN UQC list (NOS for pieces, KGS for kilograms, LTR for litres, etc.) automatically. Where a UQC mapping is uncertain, the tax reviewer is flagged at item creation.
Can we change the primary unit after it has been used?
Changing the primary unit retroactively is supported but requires CFO approval and a transition workpaper. The change captures the conversion of historical balances; the audit trail logs the change as a tracked event.
Configure one item with three units. See the documents flow.
Free trial, one item. Set primary, secondary, conversion. Raise a PO in cartons, a GRN in pieces, an invoice in kilograms. Watch the conversion in the audit trail.