The Tax Amount column in the Tax Detail grid initially displays as zero before the Work/Service Order transaction is saved. Once saved, the value is updated correctly in the backend, but it continues to show as zero on the front-end. We are using the 'eval(taxformula)' expression for the Tax Amount field. I have implemented the patch up to release 7 (Version 10.9.1.1) as per your instructions, but the issue persists.