Workflow not getting triggered after Shopping Cart Change

Dear Guru's,

Mine is SRM 5.0 and is ECS.

After the Shopping cart getting rejected by the approver, the requester is able to change the shopping cart, but the workflow is not getting triggered again. Can anyone help me why is this so and if there are any settings to be done for the workflow getting triggered once again.

Points will be rewarded.

Thanks in Advance,

Mohit.