QB Issue Resolution:

rent collected should be held in a liability type account

you write the check, as the expense for the check

line one, the liability account, the full amount of rent collected
line two, your commission income account and your fee as a negative number
line three+, any expense account you used on behalf of the owner, the amount is entered as a negative number

Resolution for Issue 'Am an real estate agent. How can i post payment of rent to the landlord' available: Yes (Solved).
Source: Intuit Community forum.

Am an real estate agent. How can i post payment of rent to the landlord: 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.

Support for income account
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