I posted most of this in your other question without realizing that you have created a separate one.
When you create an inquiry, quotation or sales order - this is created for a specific sales area.
Sales area is the combination of sales organization, distribution channel and division.
In your case it seems that the ship-to party customer is not extended for this sales area.
First, check if the sales area that you entered for your document is correct. If not - correct your entries and start over.
If
the sales area is correct, but the ship-to party is not - you can
change it manually in the sales document (if the correct ship-to party
exists in the system, of course).
If this is the correct sales
area and if the ship-to party number is the right one - you or somebody
with the right authorizations has to extend (create) the ship-to party
for this sales area.
This is done via transaction code XD01 or VD01 if you
are on ECC. For S/4HANA you use transaction code BP. If you do not use SAPGUI, but Fiori Launchpad - search for business partner in the launchpad, restricting the search to apps. If master data maintenance in your company is centralized and subject to approvals, the process will be a bit different. In such case it is best to read the documentation which you received from the implementation company, or ask your colleagues, or ask your local support team.
As an alternative
to maintaining a lot of customer numbers you can use one-time customers
(if this is allowed in your company). This is like a generic customer
number; when you enter it in a sales order, you see a popup asking you
to maintain the actual address, customer name, tax number and so on.
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