The correction is LM6017T released on March 9th, 2021. The Knowledgebase # is 108683
The problem is fixed for the upcoming Sage100 2021 release scheduled for April.
The other solution may be to fix the report to accept large values. Access Custom Report Maintenance, Main tab and modify the 3 fields – Amount Mask ##,###,###,##0, Maximum Report Width 181, and Y-T-D Tab Position 96.
Depending on the values contained in the fields, these numbers may need to be increased. Note: These General Ledger Custom Financials do have limitations, among them being that the GL accounts cannot be greater than 9 characters or 3 segments . Such users will need to use the GL Financial Reports or Sage Intelligence Reporting, or other report writer.