There are two ways that you can assist your customers in entering their PO numbers. The first is specifying a Default PO number. This will be automatically populated until you change it. This is helpful when your customer uses the same PO number over many orders. 

The second way is using Custom structured PO numbers. This allows you to create a specific format that will only be accepted as a PO number. For example two letters followed by four numbers. This helps you to comply with your customers accounts departments regulations. 

See the details below on each feature. 

If your store is integrated with an ERP Live Lookup, this is done in Step 1 of checkout. This will use the values provided by the ERP unless the EvolutionX Customer Account or User Record has more specific requirements. Note that the EvolutionX Admin record of the customer account and user PO settings will only show the store settings and not the ERP settings. Here are a list of supported ERP integrations:

If any of the following options are configured in the DDMSPLUS field P/O Required?, the PO field will become mandatory during the checkout process: Y, L, E, X, M, #, $.

While all of the above options mandate the entry of a PO during checkout, they also influence various features and workflows within DDMSPLUS. It is recommended that dealers consult their DDMSPLUS documentation or support to understand the specific implications of each option.

In Eci Horizon, Trader masks allow you to define the format of the order reference, specific to each customer. These masks are part of the customer / trader sync.

Mandatory masks can also be configured by selecting 'require order number' in Horizon.

A PO can be required on orders in one of the following 4 ways:

Note that other sections of this article cover default values and special validation requirements.

Requiring the use of a PO number to place an order must be done at the User level.  Find the Account, then find the user, then select the toggle to require a PO number as seen here:

Requiring an PO value can be done by setting the PO Structure value to the following Regular Expression (Regex):

The default PO number is very easy to use. Simply specify the PO number that you want to be defaulted and it will be automatically added at checkout. This is available at the account level and user level. 

There is a global role permission called "Lock Default PO Number." When this permission is enabled, the Default PO Number value is locked during checkout. This means the Default PO number, if populated, cannot be modified by users at checkout. The default value can come from the Customer Account configuration or ERP live lookup, depending on your store setup.
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You can specify at the account and/or user level (when present a user setup would override the account level instance) a particular structure for their PO Numbers, then using RegEx you can accommodate almost any required format.

Firstly navigate to the customer requiring this feature and click to edit that account (or if it's a user, navigate to the User tab > select the required user and edit). If you scroll down you'll see a section labelled 'Default PO Structure'.

Now you'll need to create the RegEx structure to match the customer PO format, so we'll break this down, using some examples:

All the structures will begin with ^ followed with the exact requirements, in its simplest format shown in the examples above is to set a max/min or exact length and this will allow for any combination of characters.
If you need to get more specific, the last example is a great example of requiring a 7 character PO Number with the Characters and numbers separated by a pipe |. To break this down ^ to start the structure, \w{2} \w is for words so alphabetical letters only and the {2} means it is an exact length of 2 letters.
Next is to accommodate the pipe | symbol \| \ starts this element so simply add the required symbol e.g. \| or \- etc.
Finally add in 5 numbers \d{5}$ so again start the element with a \ then a d for digit (numbers only) within {} add how many digits are required and then complete the structure with $

We've included a useful test tool, so once you've created your structure simply type in an example and if it matches your RegEx structure it'll tell you it's valid!
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There is also a useful Advance Tester link that breaks down the structure and again tells you if your test PO Number matches your structure

If you would also like to display a message to the user to remind them of their required PO Number structure, there is a free text field to enter a useful reminder!
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This will then show on their checkout screen as a reminder.

The Alternative PO setting enables an alternative PO input in the last checkout step.

Go to the EvolutionX Admin and click Store Settings → General and under

Store Preferences scroll to Order Settings section. Enable the Alternative PO and and set the preferred label, for example Gasses PO. Also you can set the alternative PO to be always required.