When using mapping groups, you can enter product data in EffectConnect, which the marketplace asks you to put new products online or improve existing product information. However, it may happen that you don't have certain information, or perhaps it is not applicable to your products.
Sometimes, you are allowed to fill in a value that tells the marketplace that the information is not applicable to your products. For example, in the case of an Amazon channel, it is allowed to fill in 'not applicable' when the field is really not applicable to your product(s). However, this can differ per marketplace.
In these cases, it is best to contact the marketplace itself to explain your situation. They can best advise you on what to do to complete the product information.