> For the complete documentation index, see [llms.txt](https://docs.solutioo.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.solutioo.de/datanorm-item-import/datanorm_en_us/master-data-and-mappings/unit-mapping.md).

# Unit Mapping

## Why this table exists

DATANORM delivers an article's unit of measure as a short code. In DATANORM 5 that is usually an ISO code such as `PCE` or `MTR`; in DATANORM 4 it is often a freely chosen German abbreviation such as `ST`, `Stck` or `M`. Business Central does not know these codes.

The **DATANORM Unit Mapping** page translates between the two worlds.

{% hint style="warning" %}
Without a matching mapping an imported item gets **no base unit of measure**. So run **Initialize Units** once after installation, from [Base Configuration](/datanorm-item-import/datanorm_en_us/getting-started/base-configuration.md).
{% endhint %}

## Creating mappings

{% stepper %}
{% step %}

#### Create the default mappings

**DATANORM Setup → Initialize Units**. This creates mappings for the common ISO codes and the widespread German abbreviations from DATANORM 4 – including `ST`, `STK`, `M`, `CM`, `KG`, `L`, `M2`, `M3`, `PA`, `PAK`, `ROL`, `DS` and `SA`.
{% endstep %}

{% step %}

#### Check the result

Open **DATANORM Unit Mapping** and verify that every row has a BC unit of measure. The action never overwrites existing mappings, so it is safe to run again.
{% endstep %}

{% step %}

#### Add missing units

If your supplier delivers a unit that is not covered, create the row manually: enter the DATANORM code and select the matching BC unit of measure.
{% endstep %}
{% endstepper %}

## Examples

<table><thead><tr><th width="200">DATANORM code</th><th width="230">Meaning</th><th>BC unit of measure</th></tr></thead><tbody><tr><td><code>PCE</code>, <code>ST</code>, <code>STK</code></td><td>Piece</td><td><code>PCS</code></td></tr><tr><td><code>MTR</code>, <code>M</code></td><td>Metre</td><td><code>M</code></td></tr><tr><td><code>MTK</code>, <code>M2</code></td><td>Square metre</td><td><code>M2</code></td></tr><tr><td><code>MTQ</code>, <code>M3</code></td><td>Cubic metre</td><td><code>M3</code></td></tr><tr><td><code>KGM</code>, <code>KG</code></td><td>Kilogram</td><td><code>KG</code></td></tr><tr><td><code>LTR</code>, <code>L</code></td><td>Litre</td><td><code>L</code></td></tr><tr><td><code>PA</code></td><td>Pair</td><td><code>PR</code></td></tr><tr><td><code>ROL</code></td><td>Roll</td><td><code>ROL</code></td></tr><tr><td><code>SA</code></td><td>Set</td><td><code>SET</code></td></tr></tbody></table>

{% hint style="info" %}
The BC unit of measure must exist in **Units of Measure**. If it does not, create it there first and then point the mapping at it.
{% endhint %}

## When a unit is unknown

If the import meets a unit code with no mapping, the article is still imported but stays without a base unit of measure. You can see this in article staging. Create the missing mapping and synchronise the record again – there is no need to re-read the file.


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