You can resolve this by maintaining the planning level for the G/L Account in the Manage G/L Account Master Data under the Company code data.
For Journal Entries that were posted in the past without a planning level or with an incorrect planning level, you can schedule jobs for Program Planning Correction using the template app "Schedule Job for Planning Fields Rebuilding" help.sap link . To access this app, open the app tile "Schedule Job for Flow Builder", and select the job template "SAPJ Template for Planning Correction".
Refer the SAP KBA https://me.sap.com/notes/3502685
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