QB Issue Resolution:

When adding the Customer as a Supplier, there’s should be a difference in their names. You can either add a middle name or an initial with the new one. Example: RC Company (Supplier) and RC Company (Customer).

Here’s how to add a new Supplier:

  1. From the left menu, select Expenses.
  2. Choose Suppliers.
  3. Select New Supplier.
  4. Complete the fields in the Vendor/Supplier Information window, then enter the supplier name with a unique character
  5. Once done, click Save.

Resolution for Issue 'i have a customer that is now a supplier as well and can not enter his information as a supplier…' available: Yes (Solved).
Source: Intuit Community forum.

i have a customer that is now a supplier as well and can not enter his information as a supplier…: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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