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using collection in where clause: JPAQL

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I have a ManytoOne and a OneToMany association relation b/w two entities ( created by eclipse link)

Now the parent entity : states :
//bi-directional many-to-one association to CsscBffrdCmdtyGrpCmdty (CHILD )
@OneToMany(mappedBy = "csscBufferedCmdtyGroup")
private List<CsscBffrdCmdtyGrpCmdty> csscBffrdCmdtyGrpCmdties;

//bi-directional many-to-one association to CsscBufferedCmdtyGroup
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "BUF_CMDTY_GRP_INTL_ID", nullable = false)
private CsscBufferedCmdtyGroup csscBufferedCmdtyGroup;

Now I want to query such that I can send across one parent attribute and one child attribute in the where clause . Can that be done ?

I have written a query -
" select b from CsscBufferedCmdtyGroupb where " +
" b.csscBffrdCmdtyGrpCmdties.bufferCommodityId = :bufferCommodityId " +
" and b.projectId =:projectId ")

Now the error I get is 'csscBffrdCmdtyGrpCmdties' cannot be navigated .
So should I be using b.csscBffrdCmdtyGrpCmdties.bufferCommodityId in (:bufferCommodityId )

Will this work ?

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You need to use a JOIN,

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