QB Issue Resolution:

Is there by chance a separate password for the closed period? There can be. You cannot change transactions in a closed period without removing the closed restrictions.

BTW, voiding a check in a prior period is never the correct way to do this, even in cash accounting. If this was a check you wrote then it was counted as an expense in that prior period and MUST be accounted for as income in the current period. Voiding is only appropriate when you are doing so within the same tax reporting period.

Offset the original check with a Deposit entry dated in current period that reverses whatever the original check represented.  Now when you reconcile the original check and the deposit offset will balance out to zero.

Resolution for Issue 'QuickBooks will not let me void an old payment' available: Yes (Solved).
Source: Intuit Community forum.

QuickBooks will not let me void an old payment: 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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