No ordering party exists in project &1

What causes this issue?

The system cannot carry out sales pricing for one of the following
reasons:
No partner is defined for the <ZH>sold-to party</> partner role in the
project.
The sold-to party has not been created in the sales area specified for
the sales pricing.

System Response

Sales pricing is not possible.

How to fix this error?

Go to the project definition and maintain a partner for the <ZH>sold-to
party/> partner role.
If necessary, you must also create the partner in the sales area
specified in the project definition for the sales pricing.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.