In "Ocean of Reasoning" (p. 355) Tsongkhapa says in the commentary to MMK 17:14,
"Although all virtuous and nonvirtuous actions cease immediately upon their completion, they are not without effects, because when the karma arises, a nonmental compound called an indestructible element associated with karma arises in the continuum of the agent like a promissory note."
What is this nonmental element associated with karma? It sounds like an abhidharmic teaching, however, from the text it appears to me that Tsongkhapa actually accepts the existence of such an element. Could anyone explain please?

