## Documentation Index

Access the complete documentation index at:
https://www.zoho.com/us/books/kb/llms.txt

Use this file to discover all available documentation pages before proceeding.

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# I’m unable to create a transaction for a customer/vendor. What’s going on?

This might happen due to the contact type being wrongly specified. A contact can either be indicated as a vendor (sells goods or services to you), customer (buys goods or services from you) under the field **Contact Type**.

*   Contacts marked as **Customer** can only be involved with quotes, invoices and credit notes. Bills and expenses cannot be created for them.
*   Contacts marked as **Vendor** can only be involved with bills and expenses. Other transactions cannot be started for these contacts.

A contact can be changed anytime from a vendor to a customer and vice versa, by editing the **Contact Type** field in the Contact Details Page.