When you set up a club run, WithWine works out how many bottles of each wine you need and compares it with your stock. If you don't have enough, you see a warning.
How the stock check works
Under each wine in the club run you see a stock line, for example Stock: 48 of 107:
The first number is the bottles the club run needs: the quantity in the club pack multiplied by the number of members in the club run. 6 bottles × 8 members = 48.
The second number is your current stock.
The line is green when you have enough and red when you don't, for example Stock: 8 of 0.
Only wines with stock tracking turned on show a stock line.
What the warning looks like
When any wine is short, a red box at the bottom of the pop-up says Insufficient stock available. The Review Club Run button stays greyed out until you tick I have read the error message and still want to process this club run.
What happens if you post anyway
If you tick the box and post the club run, WithWine charges every member as normal. Missing stock doesn't stop the charges. Your stock goes negative (oversold) for the wines you didn't have, so you'll need to find more stock or change those members' orders.
The Review Club Run step doesn't repeat the stock warning, so decide before you tick the box.
How to fix a stock shortfall before posting
Add stock for the wine, then start the club run again.
Swap the wine for one you have enough of.
Post the club run to fewer members, for example by preference. See "How to send a club run to only some of your club members".