If your SAP transport operation terminates and you need to reset your buffer to continue the operation then you should check the following steps to do this…

For an example,  you are getting the following message while installing a support package with SPAM

Than you can do the following steps to start from beginning for fresh operation..

Goto SE37 and execute the function module “OCS_RESET_QUEUE”

You will get the followin screen and then insert the following values;

IV_TOOL = SPAM

IV_FORCE = X

Finally please confirm the following screen.