Enter the account type first of all

What causes this issue?

The entry facility for the account number is initiated via matchcode
search. Separate matchcodes exist for every account type (customers,
vendors, G/L accounts). The matchcodes which are suitable can, in this
case only be determined by means of account type.

System Response

The entry facility can only be supplied after entering the account
type.

How to fix this error?

Enter the required account type before you use the possible
entries pushbutton for the account number.

Error message extract from SAP system. Copyright SAP SE.