Error: "The callout was unsuccessful after 4 attempts: You have uncommitted work pending"

[doyeli]

Problem:

Error  "The callout was unsuccessful after 4 attempts: You have uncommitted work pending" was thrown when the following code was getting executed from custom Apex Class

zqu.zQuoteUtil.ZBillingResult previewResult = zqu.QuoteRecalculateController.JR_recalculate('<QuoteID>');

[doyeli · Accepted solution]

Solution:

This salesforce error is thrown when making a DML statement (create, update, delete, etc) before a callout (preview call to Zuora).

In this particular case, it was found the custom code had

Database.update(quoteList.values());

before the preview call

zqu.zQuoteUtil.ZBillingResult previewResult= zqu.QuoteRecalculateController.JR_recalculate(op.id);

After commenting out the update call and running it separately, could help resolve this error.