master/child link not working? and whitespace

[notaloser]

hey, here is my setup

i have a GENERAL table with medical patients basic information.
then i have multiple other tables (medications, visits, diagnosis, referring doctors), all linked by HistNum.

i have a form that opens a report filtered to a single patient and is going to display all of these tables. there is the main information on top, and then a subreport for the reffering doctor (this is all i have so far)

in the subreports properties, i have the Master/Child links set correctly by HistNum but nothing appears.. however, if i change it to ID, which is an irrelevant field in both tables, information does appear..

also, in an earlier thread where i ask about how to eliminate the whitespace left behind from cells of the table that are missing, i was told to "set the height of the controls to a negligible height and the can grow to yes", then the missing lines should be eliminated. for this, do all my fields i want displayed have to be part of 1 big text box, or multiple? (right now i use multiple)

what does this person mean by a negligible height?

heres a screenshot of the report

 

[pbaldy]

what does this person mean by a negligible height?

According to the Merriam-Webster Online Dictionary, negligible means:

so small or unimportant or of so little consequence as to warrant little or no attention

so it seemed obvious to me that setting a textbox to negligible height meant to set it to a very small height. The can grow property being set to yes will allow the textbox to grow to a readable height at runtime if there is something there. If there's nothing there, being set so small will mean that it's effectively not there, thus eliminating the white space.

 

[notaloser]

ooh ok haha thanks a lot, i get it now.. i looked it up and tried it but messed up last time..

what about my master/child linking?