Yes, it is possible. The maximum number of characters allowed for application/process comments can be increased by setting the workflow parameter "proc-comment-size".
The unit for this parameter is half-width characters. Full-width characters are counted as four half-width characters.

Please note that the maximum number of characters you can set depends on the specifications of your database.
For more details, please refer to your database specifications.

For details on "proc-comment-size", please refer to the following document.

* intra-mart Accel Platform IM-Workflow specifications
　5.1.2.18. Setting input item
　https://document.intra-mart.jp/library/iap/public/im_workflow/im_workflow_specification/texts/setting_guide/setting_list/tenant_unit/setting_guide_20.html

For information on how to set workflow parameters, please  refer to the following document.

* intra-mart Accel Platform IM-Workflow Administrator Operation Guide
　4.5. Set workflow parameters
　https://document.intra-mart.jp/library/iap/public/im_workflow/im_workflow_administrator_guide/texts/basic_guide/basic_guide_12.html

Additionally, if you change the maximum number of characters that can be entered in comments, you also need to change the column size in addition to the settings above.
Please refer to the following document for column size settings.

* intra-mart Accel Platform IM-Workflow specifications
　5.2.2. Column size settings for comments during application/processing
　https://document.intra-mart.jp/library/iap/public/im_workflow/im_workflow_specification/texts/setting_guide/column_size/setting_guide_32.html

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