and when i click on help i got this:
This error can appear if:
You have exceeded the maximum number of columns allowed in a table or the maximum number of locks for a single file.
The indexed property of a field was changed from Yes (Duplicates OK) to Yes (No Duplicates) when duplicate data is already present in the table.
but i just have 14 columns!!
item(Article,stock,price,code_supp,st_q1,st_q2,... ,st_q10)
actually this error occurred when i was trying to put the default value of stock equal this
Expand|Select|Wrap|Line Numbers
- (st_q1+st_q2+st_q3+st_q4+st_q5+st_q6+st_q7+st_q8+st_q9+st_q10)