QB Issue Resolution:

deposit with the vendor is easy, check or credit card use accounts payable in the expense section and on that same account line select the vendor name in the name column, that sets a vendor credit that you apply to the bill when it comes in

the quarterly rebate however is a different thing, it can not adjust COGS quarterly. a rebate is income, and should be posted as such. I would track the rebate in a separate income account and assign the job to that income transaction

IF your accounting and tax laws allow it, you could also post the rebate to the COGS account instead of an income account, lowering COGS, again assigning the job to the transaction

Resolution for Issue 'How to Adjust Vendor Rebate / Incentives with INVENTORY ?.' available: Yes (Solved).
Source: Intuit Community forum.

How to Adjust Vendor Rebate / Incentives with INVENTORY ?.: 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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