> <xsl:with-param name="ds-predecessor"
select="/fssc/component-list/processes/process[data-sinks/data-sink[.=@id]]"
/>

This is saying "is the string value of data-sink equal to the id
attribute of data-sink", whereas I think you meant to check against id
attribute of the context node, eg:

/data-sink[. = current()/@id]

cheers
andrew