While filling service tax return you have encountered with the issue that system is not allowing to complete tax return because Pay and Preview button is grayed out.
Reproducing the Issue
1. Go to Payment Management work center.
2. Click on Service / Excise Tax Returns.
3. Select option All Tax Returns in show field and click on Go button.
4. Select your desired Tax Return IDs and click on View button.
5. Service Tax Payment window will open and you can find that Pay and Preview button is grayed out.
Root cause of this issue is that your desired tax returns has completed status and the tax payments of the returns already in released status. For already paid tax return the pay button will not be enabled. Preview button will come only for tax returns that have form output. For the service tax challan, there is no form output provided by SAP. That's the reason the preview button will not be enabled for Service Tax Challan return.
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