If you're booking in with DPD Local and Shiptheory, you may see the following error message appear on an order:

This error can occur despite the fact that your order doesn't actually exceed the weight limit of that service. The reason for this has been confirmed by DPD as a restriction currently on their end with order weights;

If your order weight contains multiple decimal places, rather than just one, it will cause this error, such as the weight shown below:

What is recommended for these, is to modify the weight to round to the nearest decimal place, so this order would become like so:

After that, you should then be able to book in with that service. If you still have issues following this, or would like any further assistance, please feel free to Contact Support.